Interpreting Data on General Intellectual Ability Tests
What do the General Intellectual Ability Score, Stanine and Percentile Rank tell me?
Below is a chart that will give a comparison of the General Intellectual Ability, Percentile Rank and Stanine as reported on
comparative tests.
General Intellectual Ability Score
Reported as
 SAS - Standard Age Score (CogAT)
 CSI – Cognitive Skills Index (TCS)
 SAI – School Ability Index (OLSAT)
128 and above
120-127
112-119
104-111
96-103
88-95
80-87
72-79
71 and below



4-2010
Range of Percentile Ranks (Average of
Population in This Range)
Stanines
96% and above
89-95%
77-88
60-76%
40-59%
23-39%
11-22%
4-10%
Below 4%
9
8
7
6
5
4
3
2
1
(4%)
(7%)
(12%)
(17%)
(20%)
(17%)
(12%)
(7%)
(4%
Chart prepared to assist in interpreting test scores.
The chart serves as a general measure to follow.
Infrequent and slight variations could occur in results from one specific test to another.
Highest level
High level
Well Above Average
Slightly above average
Average
Slightly below average
Well below average
Low level
Lowest level