Selected morbidity data for
publicly funded hospitals
1 July 2003 to 30 June 2004:
Summary Tables
New Zealand Health Information Service 2007
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Disclaimer
The purpose of this publication is to inform discussion and assist
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not necessarily reflect the official views of the Ministry of Health.
All care has been taken in the production of this publication; the
data were deemed accurate at the time of publication, but may be
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Acknowledgements
Many people have assisted in the production of this publication. In
particular, the New Zealand Health Information Service thanks the
peer reviewers for their valuable contribution.
Source
The data for this publication are sourced from the National
Minimum Data Set (NMDS). This information is held by the New
Zealand Health Information Service.
Suggested citation: New Zealand Health
Information Service. 2007. Selected Morbidity
Data for Publicly Funded Hospitals 1 July 2003 to
30 June 2004: Summary Tables Wellington:
Ministry of Health.
ISBN 978-0-478-30798-6 (online)
Published in 2007 by the
Ministry of Health
PO Box 5013, Wellington, New Zealand
This document is available on the New Zealand
Health Information Service’s website:
http://www.nzhis.govt.nz
and the Ministry of Health’s website:
http://www.moh.govt.nz
Contents
Copyright
2
Contents
3
List of tables and figures
4
Introduction
5
Statistical coverage
5
Data source
5
Terms
6
Symbols used
8
Summary tables
9
Appendix
20
Population data changes
20
Calculations
22
Segi’s world population
23
Ethnicity
24
Additional information available
25
Glossary
26
List of tables and figures
Table 1: Publicly funded hospital discharges, inpatient and day patient
numbers, 2003/04 .................................................................................................... 9
Table 2: Publicly Funded hospital discharges by age, sex and ethnicity,
2003/04 .................................................................................................................... 9
Table 3: Inpatient mean length of stay by sex and ethnicity, 2003/04 .................................. 10
Table 4: Publicly funded discharges from hospitals, percentage by age
group, 1995/96–2003/04 ........................................................................................ 10
Figure 1: Publicly funded discharges from hospitals, percentage by age
group, 1995/96–2003/04 ........................................................................................ 11
Table 5: Discharges from public hospitals, age specific and agestandardized rates, 1995/96 – 2003/04* ................................................................. 12
Figure 2: Age-specific hospitalization rates per 100,000 by age, 1995/96–
2003/04 .................................................................................................................. 13
Figure 3: Causes of injury and poisoning - public hospital discharges,
total population, 2003/04 ........................................................................................ 14
Figure 4: Causes of injury and poisoning - public hospital discharges,
Māori population, 2003/04 ...................................................................................... 14
Figure 5: Causes of injury and poisoning - public hospital discharges,
Pacific Peoples population, 2003/04 ....................................................................... 15
Table 6: Injury and poisoning, inpatient mean stay and bed days by sex
and ethnicity, 2003/04 ............................................................................................ 15
Table 7: Public hospital discharges involving injury or poisoning, total
population, 2003/04 ................................................................................................ 16
Table 8: Public hospital discharges involving injury or poisoning, Māori
population, 2003/04 ................................................................................................ 17
Table 9: Public hospital discharges involving injury or poisoning, Pacific
Peoples population, 2003/04 .................................................................................. 18
Table 10: Hospital discharges involving intentional self-harm, by sex and
ethnicity, percentages and numbers 2003/04 ......................................................... 19
Table 11: Hospital discharges involving intentional self-harm by sex,
numbers and age-specific rates per 100,000 population, 2003/04 .......................... 19
Table 12: Mean length of stay for discharges involving intentional selfharm by sex and ethnicity, 2003/04 ........................................................................ 19
Table 13: Youth hospitalizations for intentional self-harm by sex and
ethnicity, numbers 2003/04 .................................................................................... 19
Introduction
Statistical coverage
The statistics in this report refer to inpatient and day patient public hospital discharges from
1 July 2003 to 30 June 2004. Information about patients treated in private hospitals under
publicly funded contracts is also included. Patient discharge details for licensed rest homes
are excluded from this report.
Data source
The data for this report are drawn directly from the National Minimum Dataset (NMDS). No
filtering has been carried out in the production of this publication. Consequently, if hospitals
differ in their interpretation of the guidelines for reporting data to the NMDS, no adjustment
for this has been made to the data presented in this report.
Data held by the NMDS and reported on in this publication may vary over time as historical
records are updated. Please refer to the Analytical Services team of the New Zealand
Health Information Service for validation of current data.
Analytical Services
Business Intelligence Unit
New Zealand Health Information Service
Ministry of Health
PO Box 5013
Wellington
New Zealand
Telephone: (04) 922 1800
Fax: (04) 922 1899
E-mail: inquiries@nzhis.govt.nz
Terms
Coding standards
In July 1995, the New Zealand Health Information Service adopted the Australian
Version of the International Classification of Diseases (Clinical Modification) (ICD–9
CM–A) and the Australian National Coding Standards. This resulted in a change to
classification of procedures and discharges. Due to delays in the standards being
uniformly interpreted across all reporting hospitals, some figures from the 1995/96,
1996/97, 1997/98, and 1998/99 public hospital publications may not be comparable
with each other or with earlier years. For further information on changes to
classifications of discharges and procedures, see the earlier Selected Morbidity Data
for Publicly Funded Hospitals 1995/96, 1996/97, 1999/00 publications.
Between the 1 October 1998 and 31 March 1999, the International Statistical
Classification of Diseases, 10th Revision, Australian Modification, 1st Edition (ICD–10
AM) was introduced to code hospital discharges and procedures. ICD–10 AM was
superseded in July 2001 by the International Statistical Classification of Diseases,
10th Revision, Australian Modification, 2nd Edition. This method of coding discharges
and procedures replaced the ICD–9 AM used in previous publications. Due to this
coding change, some figures from previous public hospital discharge publications
may not be comparable with the data reported in this publication. For example, one
area affected by the coding change is the coding of external causes of morbidity and
mortality.
Discharges involving injury and poisoning
This publication reports on principal diagnoses. If this condition was the result of an
injury or poisoning, an injury code describing the circumstances of the injury or
poisoning is also recorded. This publication presents information on the first reported
injury code only.
In some circumstances, the published injury code relates to a secondary diagnosis.
This will occur when the secondary condition arose during the stay in hospital as the
result of an external cause (for example, complication of surgery or medication) and
the principal diagnosis is not the result of an external injury or poisoning.
Healthy newborn babies
The requirement to admit healthy newborn babies and submit data relating to them
came with the signing of the 1991/1992 contracts between the then Department of
Health and Area Health Boards. Before this, newborns were only treated as
admissions if they were ill or otherwise required a level of care in excess of that
given to a normal healthy newborn infant. Healthy newborn babies have been
gradually included in hospital records since then, with all newborn babies included
by 1 January 1994.
Psychiatric Hospitals
The number of hospital discharges referred to in this report includes those patients
discharged from psychiatric hospitals (Facility type–03). The majority of these
discharges are in Chapter V – Mental, Behavioural Disorders (F00–F99) of the ICD–
10 AM categories.
Classification of public hospital deaths and discharges
The number of hospital discharges referred to in this report includes patients who
were re-admitted for the same condition and patients who were transferred to other
hospitals or residential institutions. Thus, there may be more than one discharge per
immediate 'episode' of illness. Discharge figures also include any patients who die in
hospital after formal admission.
Classification of day patients
Before 1986, when a patient was discharged the same day that they were admitted,
the length of stay was recorded as one day. Since 1986, these patients are now
recorded as a stay of zero days.
Before 1988, there was no requirement for hospitals to report patients who were
discharged on the day that they were admitted, where the intention had been for the
discharge to be on the same day as the admission. There is no fixed date for the
commencement of collection of these cases, and different hospitals commenced
reporting at different times. By 1992, all were being reported.
The increase in day patients shown in the following table is partly due to the opening
of new units especially for day patients, and partly to hospitals gradually including
patients from existing day units in the data submitted. It also reflects advances in
medical technology facilitating more day surgery and day patient diagnostic
procedures.
Day patient discharges from publicly funded hospitals, 1989-2003/04
Year
Male
Female
Total
2003/04
125,428
139,890
265,318
2002/03
122,185
135,045
257,230
2001/02
117,539
132,615
250,154
2000/01
108,828
127,251
236,079
1999/00
94,824
112,820
207,644
1998/99
86,354
103,081
189,435
1997/98
77,729
95,481
173,210
1996/97
67,511
84,825
152,336
1995/96
62,606
79,627
142,233
1995
58,896
75,268
134,164
1994
64,714
79,603
144,317
1993
57,249
70,297
127,546
1992
47,177
62,822
109,999
1991
35,824
51,750
87,574
1990
28,668
42,349
71,017
1989
22,338
34,386
56,724
Ethnicity
NMDS records up to three different ethnicities, and for ease of analysis the multiple
ethnic groups recorded for individuals are prioritised to one ethnic group. See the
Appendix for details of the prioritisation process.
Symbols used
The interpretation of the symbols used throughout this publication is as follows:
.. = figures not available
... = calculation of rates not applicable
Summary tables
Table 1: Publicly funded hospital discharges, inpatient and day patient numbers, 2003/04
Inpatient
Day Case
Total
Sex
Non-Māori, non-Pacific
Peoples
Māori
Pacific Peoples
Total
Number
%
Number
%
Number
Male
193,648
67.2
94,711
32.8
288,359
Female
257,507
71.1
104,831
28.9
362,338
Total
451,155
69.3
199,542
30.7
650,697
Male
37,625
62.0
23,040
38.0
60,665
Female
52,275
67.1
25,631
32.9
77,906
Total
89,900
64.9
48,671
35.1
138,571
Male
16,780
68.6
7677
31.4
24,457
Female
22,907
70.8
9428
29.2
32,335
Total
39,687
69.9
17,105
30.1
56,792
Male
248,053
66.4
125,428
33.6
373,481
Female
332,689
70.4
139,890
29.6
472,579
Total
580,742
68.6
265,318
31.4
846,060
Table 2: Publicly Funded hospital discharges by age, sex and ethnicity, 2003/04
Non-Māori, non-Pacific Peoples
Māori
Pacific Peoples
Total
Age group
Total
discharges
0–14
15–24
25–44
45–64
65+
Male
288,359
60,926
17,997
41,370
63,743
104,323
Female
362,338
51,546
33,039
105,485
59,591
112,677
Total
650,697
112,472
51,036
146,855
123,334
217,000
Male
60,665
22,787
5538
10,771
13,943
7626
Female
77,906
18,446
15,197
24,233
12,836
7194
Total
138,571
41,233
20,735
35,004
26,779
14,820
Male
24,457
11,382
2115
4192
4130
2638
Female
32,335
9163
5048
11,420
4001
2703
Total
56,792
20,545
7163
15,612
8131
5341
Male
373,481
95,095
25,650
56,333
81,816
114,587
Female
472,579
79,155
53,284
141,138
76,428
122,574
Total
846,060
174,250
78,934
197,471
158,244
237,161
Sex
Table 3: Inpatient mean length of stay by sex and ethnicity, 2003/04
Mean stay (days)
Male
Female
Total
Non-Māori non Pacific Peoples
8.2
9.9
9.2
Pacific Peoples
5.4
5.1
5.2
Māori
6.1
4.2
5.0
Total
7.7
8.7
8.3
Table 4: Publicly funded discharges from hospitals, percentage by age group, 1995/96–2003/04
Age group
Sex
1995/96
1996/97
1997/98
1998/99
1999/00
2000/01
2001/02
2002/03
2003/04
0–14
15–24
25–44
45–64
65+
Male
31.4
7.4
14.8
18.1
28.3
Female
18.7
13.9
32.2
13.0
22.1
Total
24.1
11.1
24.8
15.2
24.8
Male
29.9
7.1
15.2
18.7
29.1
Female
18.2
13.2
32.1
13.4
23.2
Total
23.2
10.6
24.8
15.6
25.7
Male
29.3
6.7
15.3
19.1
29.6
Female
18.0
12.4
31.9
14.0
23.6
Total
22.9
10.0
24.7
16.2
26.2
Male
28.6
6.5
15.0
19.5
30.4
Female
17.7
11.8
31.3
14.4
24.8
Total
22.5
9.5
24.2
16.6
27.2
Male
28.0
6.4
14.9
19.6
31.1
Female
17.4
11.3
31.0
14.8
25.5
Total
22.0
9.2
24.0
16.9
27.9
Male
26.8
6.7
15.6
20.4
30.4
Female
17.0
11.5
30.7
15.4
25.4
Total
21.3
9.4
24.1
17.6
27.6
Male
25.8
7.0
16.1
21.1
30.0
Female
17.0
11.3
30.3
15.9
25.5
Total
20.9
9.4
24.0
18.2
27.5
Male
25.7
6.9
15.7
21.3
30.4
Female
16.8
11.3
30.1
16.0
25.8
Total
20.7
9.3
23.7
18.4
27.8
Male
25.5
6.9
15.1
21.9
30.7
Female
16.7
11.3
29.9
16.2
25.9
Total
20.6
9.3
23.3
18.7
28.0
Note: percentages do not sum to 100 due to rounding.
Figure 1: Publicly funded discharges from hospitals, percentage by age group, 1995/96–2003/04
Table 5: Discharges from public hospitals, age specific and age-standardised rates per 100,000
population, 1995/96–2003/04*
Sex
1995/96
1996/97
1997/98
1998/99
1999/00
2000/01
2001/02
2002/03
2003/04
Age-standardised
rate
Age-specific rates
(Segi)
0–14
15–24
Male
15,565
20,236
7294
Female
19,180
17,233
Total
17,367
18,776
Male
15,342
Female
45–64
65–74
75–84
85+
7461
13,871
34,562
55,257
74,745
18,801
21,009
13,375
25,556
41,853
53,493
13,022
14,362
13,623
29,810
47,102
59,695
19,187
7106
7556
14,029
35,236
56,043
74,373
18,812
16,478
18,025
20,483
13,756
26,455
42,570
56,048
Total
17,073
17,871
12,517
14,150
13,699
30,628
47,863
61,427
Male
15,908
19,627
7142
7950
14,680
36,542
58,705
80,008
Female
19,249
16,731
17,921
20,813
14,140
27,384
44,266
58,403
Total
17,570
18,219
12,457
14,524
14,409
31,762
49,972
64,801
Male
16,207
19,529
7315
8156
15,322
37,895
62,832
85,000
Female
19,436
16,615
17,764
20,918
14,597
28,864
46,709
64,904
Total
17,815
18,112
12,451
14,694
14,958
33,193
53,127
70,897
Male
16,919
20,162
7616
8598
15,776
40,658
65,206
90,192
Female
20,449
17,265
18,315
21,974
15,376
31,130
49,843
69,532
Total
18,685
18,754
12,858
15,467
15,575
35,713
56,008
75,736
Male
18,087
20,782
8685
9824
17,372
42,413
67,684
90,845
Female
21,768
17,986
20,005
23,450
16,617
32,533
52,611
72,114
Total
19,930
19,423
14,213
16,831
16,993
37,304
58,722
77,774
Male
18,604
20,834
9403
10,510
18,086
42,078
67,444
95,388
Female
21,843
18,198
19,555
23,317
16,837
32,338
52,575
73,103
Total
20,236
19,551
14,424
17,118
17,455
37,030
58,681
79,770
Male
18,443
20,846
8965
10,247
17,874
42,341
67,369
91,402
Female
21,728
18,091
19,141
23,308
16,559
32,205
52,900
73,630
Total
20,099
19,504
13,972
16,986
17,209
37,085
58,926
78,954
Male
18,341
20,938
8649
9954
17,887
41,964
66,160
91,753
Female
21,807
18,401
18,738
23,411
16,367
32,724
53,217
72,382
Total
20,081
19,704
13,588
16,895
17,120
37,174
58,715
78,240
*Age-standardised to Segi’s world population. See Appendix for details.
25–44
Figure 2: Age-specific hospitalization rates per 100,000 by age, 1995/96–2003/04
Figure 3: Causes of injury and poisoning - public hospital discharges, total, 2003/04
Figure 4: Causes of injury and poisoning - public hospital discharges, Māori, 2003/04
Figure 5: Causes of injury and poisoning - public hospital discharges, Pacific Peoples, 2003/04
Table 6: Injury and poisoning, inpatient mean stay and bed days by sex and ethnicity, 2003/04
Mean stay (days)
Male
Female
Total
Non-Māori non-Pacific Peoples
7.7
9.8
8.7
Māori
6.6
5.9
6.3
Pacific Peoples
6.4
7.8
6.9
Total
7.5
9.3
8.3
Bed days
Male
Female
Total
Non-Māori non-Pacific Peoples
351,743
435,715
787,458
Māori
58,476
38,133
96,609
Pacific Peoples
23,353
17,558
40,911
Total
433,572
491,406
924,978
Table 7: Public hospital discharges involving injury or poisoning, total, 2003/04
Total number
Circumstance of injury
Number of inpatients
Number of day patients
Total
Male
Female
Total
Male
Female
Total
Male
Female
46,372
22,261
24,111
41,314
19,747
21,567
5058
2514
2544
Falls (W00–W19)
Exposure to inanimate
mechanical forces (W20–W49)
35,251
15,745
19,506
29,262
12,653
16,609
5989
3092
2897
14,090
10,347
3743
10,303
7725
2578
3787
2622
1165
Transport accidents (V01–V99)
13,125
8384
4741
9940
6466
3474
3185
1918
1267
Intentional self-harm (X60–X84)
5402
1744
3658
4008
1345
2663
1394
399
995
Assault (X85–Y09)
4242
3243
999
2437
1905
532
1805
1338
467
Exposure to animate
mechanical forces (W50–W64)
3664
2395
1269
2788
1768
1020
876
627
249
Accidental exposure to other
and unspecified factors (X58–
X59)
3458
1955
1503
2219
1216
1003
1239
739
500
Sequelae of external causes of
morbidity and mortality (Y85–
Y89)
3602
2367
1235
2618
1719
899
984
648
336
Overexertion, travel and
privation (X50–X57)
3331
1841
1490
2317
1279
1038
1014
562
452
Accidental poisoning by and
exposure to noxious
substances (X40–X49)
2294
1153
1141
1446
735
711
848
418
430
Contact with heat and hot
substances (X10–X19)
827
478
349
697
400
297
130
78
52
Other accidental threats to
breathing (W75–W84)
510
305
205
467
280
187
43
25
18
Exposure to smoke, fire and
flames (X00–X09)
415
317
98
344
265
79
71
52
19
Contact with venomous animals
and plants (X20–X29)
313
184
129
207
121
86
106
63
43
Supplementary factors related
to causes of morbidity and
mortality classified elsewhere
(Y90–Y9)
272
140
132
260
133
127
12
7
5
Event of undetermined intent
(Y10–Y34)
238
93
145
175
71
104
63
22
41
Exposure to forces of nature
(X30–X39)
169
88
81
128
67
61
41
21
20
Exposure to electric current,
radiation and extreme ambient
air temperature and pressure
(W85–W99)
132
104
28
83
64
19
49
40
9
Accidental drowning and
submersion (W65–W74)
107
68
39
94
59
35
13
9
4
Legal intervention and
operations of war (Y35–Y36)
55
49
6
39
36
3
16
13
3
137,869
73,261
64,608
111,145
58,054
53,092
26,723
15,207
11,516
Complications of medical and
surgical care (Y40–Y84)
Total
Table 8: Public hospital discharges involving injury or poisoning, Māori, 2003/04
Total number
No. of inpatients
No. of day patients
Circumstance of injury
Total
Male
Female
Total
Male
Female
Total
Male
Female
Complications of medical and
surgical care (Y40–Y84)
5328
2432
2896
4775
2154
2621
553
278
275
Falls (W00–W19)
3637
2120
1517
2795
1647
1148
842
473
369
Exposure to inanimate
mechanical forces (W20–W49)
2714
2008
706
2042
1538
504
672
470
202
Transport accidents (V01–V99)
2275
1461
814
1728
1115
613
547
346
201
Assault (X85–Y09)
1415
931
484
883
613
270
532
318
214
Exposure to animate
mechanical forces (W50–W64)
848
587
261
668
453
215
180
134
46
Intentional self-harm (X60–X84)
797
319
478
605
252
353
192
67
125
Sequelae of external causes of
morbidity and mortality (Y85–
Y89)
587
385
202
426
287
139
161
98
63
Overexertion, travel and
privation (X50–X57)
469
277
192
310
185
125
159
92
67
Accidental exposure to other
and unspecified factors (X58–
X59)
454
272
182
296
179
117
158
93
65
Accidental poisoning by and
exposure to noxious
substances (X40–X49)
407
196
211
264
136
128
143
60
83
Contact with heat and hot
substances (X10–X19)
225
121
104
195
105
90
30
16
14
Exposure to smoke, fire and
flames (X00–X09)
96
69
27
80
57
23
16
12
4
Other accidental threats to
breathing (W75–W84)
69
38
31
57
32
25
12
6
6
Contact with venomous animals
and plants (X20–X29)
67
37
30
51
29
22
16
8
8
Event of undetermined intent
(Y10–Y34)
44
17
27
38
16
22
6
1
5
Supplementary factors related
to causes of morbidity and
mortality classified elsewhere
(Y90–Y9)
33
17
16
32
17
15
1
0
1
Legal intervention and
operations of war (Y35–Y36)
29
25
4
19
18
1
10
7
3
Accidental drowning and
submersion (W65–W74)
26
18
8
22
15
7
4
3
1
Exposure to electric current,
radiation and extreme ambient
air temperature and pressure
(W85–W99)
24
20
4
16
14
2
8
6
2
Exposure to forces of nature
(X30–X39)
8
3
5
5
2
3
3
1
2
19,552
11,353
8199
15,307
8864
6443
4245
2489
1756
Total
Table 9: Public hospital discharges involving injury or poisoning, Pacific Peoples, 2003/04
Total number
No. of inpatients
No. of day patients
Circumstance of injury
Total
Male
Female
Total
Male
Female
Total
Male
Female
Complications of medical and surgical
care (Y40–Y84)
2367
1174
1193
2116
1048
1068
251
126
125
Falls (W00–W19)
1498
954
544
1074
689
385
424
265
159
Exposure to inanimate mechanical
forces (W20–W49)
1347
1001
346
942
715
227
405
286
119
Transport accidents (V01–V99)
671
427
244
411
277
134
260
150
110
Assault (X85–Y09)
500
378
122
314
252
62
186
126
60
Exposure to animate mechanical forces
(W50–W64)
336
247
89
234
159
75
102
88
14
Accidental exposure to other and
unspecified factors (X58–X59)
238
166
72
145
100
45
93
66
27
Overexertion, travel and privation (X50–
X57)
214
136
78
130
83
47
84
53
31
Sequelae of external causes of
morbidity and mortality (Y85–Y89)
210
150
60
167
117
50
43
33
10
Intentional self-harm (X60–X84)
163
58
105
104
40
64
59
18
41
Accidental poisoning by and exposure
to noxious substances (X40–X49)
150
76
74
103
58
45
47
18
29
Contact with heat and hot substances
(X10–X19)
94
59
35
81
49
32
13
10
3
Other accidental threats to breathing
(W75–W84)
23
14
9
22
14
8
1
0
1
Exposure to smoke, fire and flames
(X00–X09)
21
17
4
16
12
4
5
5
0
Supplementary factors related to
causes of morbidity and mortality
classified elsewhere (Y90–Y9)
9
4
5
8
3
5
1
1
0
Event of undetermined intent (Y10–Y34)
8
3
5
4
0
4
4
3
1
Legal intervention and operations of
war (Y35–Y36)
7
7
0
5
5
0
2
2
0
Accidental drowning and submersion
(W65–W74)
5
2
3
4
1
3
1
1
0
Exposure to electric current, radiation
and extreme ambient air temperature
and pressure (W85–W99)
4
3
1
3
2
1
1
1
0
Contact with venomous animals and
plants (X20–X29)
4
3
1
4
3
1
0
0
0
Exposure to forces of nature (X30–X39)
4
4
0
2
2
0
2
2
0
7873
4883
2990
5889
3629
2260
1984
1254
730
Total
Table 10: Hospital discharges involving intentional self-harm, by sex and ethnicity, percentages and
numbers 2003/04
Numbers and percentages
Male numbers
Male %
Female numbers
Female %
Total
numbers
Non-Māori non-Pacific Peoples
1367
30.8
3075
69.2
4442
Māori
319
40.0
478
60.0
797
Pacific Peoples
58
35.6
105
64.4
163
1744
32.3
3658
67.7
5402
Total
Table 11: Hospital discharges involving intentional self-harm by sex, numbers and age-specific rates per
100,000 population, 2003/04
Number by age group
Age-specific rate by age group
5–14
15–24
25–44
45–64
65+
5–14
15–24
25–44
45–64
65+
Male
25
454
868
339
58
8.0
153.1
153.4
74.1
27.3
Female
129
1139
1684
607
99
44.0
400.5
279.3
130.0
36.9
Total
154
1593
2552
946
157
25.5
274.2
218.3
102.3
32.6
Table 12: Mean length of stay for discharges involving intentional self-harm by sex and ethnicity,
2003/04
Mean stay (days)
Male
Female
Total
Non-Māori non-Pacific Peoples
5.7
4.0
4.5
Māori
5.9
2.7
4.5
Pacific Peoples
7.8
1.6
3.8
Total
5.8
3.7
4.4
Table 13: Youth hospitalisations for intentional self-harm by sex and ethnicity, numbers 2003/04
2003/04
Male
Female
Total
Non-Māori non-Pacific Peoples
325
907
1232
Māori
111
181
292
Pacific Peoples
18
51
69
Total
454
1139
1593
Appendix
Population data changes
In a major departure from historical practice, Statistics New Zealand now produces the
national population estimates to relate to the resident population. Previously, both the
national and sub-national estimates related to the de facto population concept, which
included all people in New Zealand at a given time including overseas visitors and excluded
New Zealanders temporarily overseas on census night. Statistics New Zealand has adopted
the resident population concept to ensure that estimates reflect more accurately the
population that resides in New Zealand.
The main outcome of using the resident population concept is that population estimates are
slightly higher compared with the traditional de facto estimates, and the numerator is slightly
smaller (since births, deaths, marriages, etc, registered to overseas visitors while in New
Zealand are excluded). Consequently, demographic indices calculated using usually
resident population as the denominator would be slightly lower, because a higher population
and a lower numerator will result in lower rates.
In keeping with Statistics New Zealand, the populations used in this publication are
estimated mean New Zealand resident populations. New Zealand Health Information
Service has recalculated the rates published in the 1996/97 publication using the estimated
mean resident population figures. For this reason, rate information in this publication will
differ from the rate information published in earlier morbidity data publications.
Source: Demographic Trends 2000, Statistics New Zealand
Estimated mean New Zealand resident population at 31 December 2003, by sex and age, numbers
Age Group
(years)
Estimated Resident Population at 31 December 2003
Males
Females
Total
Under 5
143,580
137,130
280,710
5–9
150,150
141,480
291,630
10–14
160,440
151,550
311,990
15–19
152,330
145,220
297,550
20–24
144,230
139,150
283,370
25–29
123,880
128,600
252,480
30–34
141,080
153,920
294,990
35–39
146,590
157,130
303,710
40–44
154,400
163,210
317,610
45–49
138,760
142,860
281,620
50–54
123,390
125,190
248,570
55–59
109,500
110,960
220,450
60–64
85,760
87,940
173,700
65–69
67,060
70,800
137,860
70–74
57,260
63,030
120,290
75–79
45,150
55,460
100,610
80–84
26,960
42,280
69,230
85–89
11,710
24,290
36,000
4320
12,690
17,010
1,986,500
2,052,900
4,039,400
90 and over
All Ages
Source: Statistics New Zealand
Note: Individual figures in this table do not always sum to give the stated totals due to rounding
Calculations
Throughout this publication, percentages for totals may not sum to 100. This is due to
rounding and is shown on each table where this applies.
Hospitalisation rates
There are two main ways of calculating hospitalisation rates:
1.
Age-specific hospitalisation rates.
Age-specific hospitalisation rates are the number of discharges in relation to
the population size of a particular age group. The calculation involves
dividing the number of discharges in an age group by the number of people
in that age group within the population. This number is then multiplied by the
size of the reference unit such as 100,000 people. The mathematical
calculation is expressed as:
Age - specific rate 
2.
number of discharges
100,000
number of people in the age group
Age-standardised hospitalisation rates.
Age-standardised rates account for differences in population age structure
and are used to compare statistics over time and between different
populations. It is expressed in this publication as the number of
hospitalisations per 100,000 population. The calculation involves dividing the
number of discharges in an age group by the number of people in the
population within that age group, then multiplying by the Segi population
figure in that age group and finally sum this value with the calculated values
of all the other age groups. The mathematical calculation is expressed as:
Age  standardis ed rate  
i
number of discharges i  SEGI population i
number of people in population i
Where i represents the age group being calculated.
Segi’s world population
Age group
Population
Age group
Population
0-4
12 000
50-54
5 000
5-9
10 000
55-59
4 000
10-14
9 000
60-64
4 000
15-19
9 000
65-69
3 000
20-24
8 000
70-74
2 000
25-29
8 000
75-79
1 000
30-34
6 000
80-84
500
35-39
6 000
85+
500
40-44
6 000
Total
45-49
6 000
100 000
Source: Segi M, Cancer mortality for selected sites in 24 countries (1950-57), Department of
Public Health, Tohoku University of Medicine, Sendai, Japan. 1960.
Ethnicity
The prioritisation system used is shown in the table below. This is the standard prioritisation
of ethnicity that was developed by Statistics New Zealand, and is used by the New Zealand
Health Information Service.
Ethnicity
Prioritisation order
Māori
1
Tokelauan
2
Fijian
3
Niuean
4
Tongan
5
Cook Island Māori
6
Samoan
7
Other Pacific
8
South East Asian
9
Indian
10
Chinese
11
Other Asian
12
Other
13
Other European
14
New Zealand European
15
Not reported
0
For example; if someone reported their main ethnicity as New Zealand European, their
second ethnicity as Samoan and their third ethnicity as Māori, then their prioritised ethnicity
will be recorded as Māori as it takes precedence in the order.
Additional information available
This publication contains selected hospital morbidity data. Should you require additional
information, analysis or material tabulated in other ways, please contact:
Analytical Services
Business Intelligence Unit
New Zealand Health Information Service
Ministry of Health
PO Box 5013
Wellington
New Zealand
Telephone: (04) 922 1800
Fax: (04) 922 1899
E-mail: inquiries@nzhis.govt.nz
Glossary
Age
The age in years of each patient at date of discharge.
Bed day
A period of a day or part thereof that a bed is occupied by an
admitted patient during the reporting period.
Community Health Trust
A Community Health Trust is an alternative health provider to a
District Health Board that allows community ownership and control of
health and disability service provision.
Day patient
A person who is admitted and discharged on the same day. Day
patients do not include those patients who died in hospital or
transferred to another hospital; these are considered inpatients.
Discharge
Discharge occurs when a patient leaves hospital to return home,
transfers to another hospital or residential institution, or dies in
hospital after formal admission. In the tables, discharges are
equivalent to the number of patients discharged, transferred from or
dying in publicly funded hospitals.
District Health Board (DHB)
District Health Boards are responsible for providing or buying
government funded healthcare services for the population of a
specific geographical area. There are 21 District Health Boards in
New Zealand, and they have existed since 1 January 2001.
Ethnicity
Public hospitals recorded up to three ethnic groups per patient in
2003/04. For the purposes of this report, a single ethnicity is selected
for each patient. See Appendix for details.
Inpatient
A person who is admitted to hospital for medical, surgical, psychiatric
or obstetric treatment, observation or care and stays at least one
night. It also includes healthy persons if formally admitted by the
hospital as boarders, and patients who die in hospital or who are
transferred to another hospital on the day of admission.
Principal diagnosis
The principal condition for which the patient was admitted to hospital.
Public hospitals
These are publicly funded hospitals and include District Health
Boards and Community Health Trusts.