Additional File 2 Characteristics of included studies Study (year of Country Setting Study aims Sample publication) Andersson [29] Data collection method/analysis Sweden* 3 Hospices To understand what it means to be a hospice Convenience sample of 10 Individual ‘narrative’ volunteer in a country without a tradition of hospice volunteers (9 women, 1 interviews/ or palliative care volunteer services. man), aged 30-70, 4 phenomenological retired, 6 months to 10 hermeneutic approach years’ experience as Opening question: what made you become a volunteer volunteer here? Then the volunteers were asked to describe personal experiences from their voluntary work. Berry [30] US Hospice 1. To investigate ethical issues that arise for Convenience sample of 39 Semi-structured individual program, hospice volunteers in working with patients, hospice volunteers interviews/ thematic mostly home families, and caregivers at the end of life. (probably self-selected), analysis following Miles & care. 2. To identify general types of ethical situations or mean age 64 years, 76% Huberman 1994 dilemmas experienced by hospice volunteers that women, median 4 years’ fall outside of guidelines suggested by their hospice experience. 33 volunteer training. volunteered with large 3. To learn more about the resources hospice hospice program (home volunteers use to manage ethical issues and care) and 6 with smaller challenges. programs. Opening statement about ethical issues. Questions: 1 Describe a situation in which you were not sure about the right of wrong thing to do from a moral or ethical point of view. 2 How did you feel about it? 3 What did you do? 4 Did you talk to anybody or consult any other sources of information? If so, please explain. 5 How was the issue resolved and if it was not, why not? 6 Say you are asked to help train the next group of volunteers. Dream big here. Tell us how you might better prepare volunteers to deal with issues similar to the ones you have described. Field-Richards [31] Finn-Paradis [32] UK US Day care To understand volunteers’ experiences of working Volunteers with patient- Semi-structured individual hospice in a day care hospice with a particular emphasis on facing roles; self-selecting interviews/ inductive and their perception of the boundaries that exist between following distribution of thematic analysis following paid and unpaid hospice workers. invitation letters from guidelines by Braun and volunteer coordinator; 12 Clarke (Qual Res Psychol. No details of the questions asked other than the last participants, 10 female, 2006; 3:77-101) question: Is there anything that we haven’t 18-73 years, with 6 weeks discussed which you feel is important in terms of to 6 years’ experience your motivations and experiences as a volunteer? (mean 16 months) Hospice To identify primary stressors experienced by 17 volunteers from Telephone semi-structured program volunteers providing direct patient care. However, hospice programs plus interviews/ catalogued including data are from a study focusing on volunteer unknown number spoken responses into 4 areas home and personality characteristics – they did telephone to at a conference inpatient care interviews with a subgroup of participants from wider study. Four open-ended questions used to elicit concerns related to stress and burnout among volunteers. Guirguis-Younger Canada To enrich our knowledge and understanding of the 3 palliative care settings – Focus groups/ grounded rewards, challenges, and unique commitments that acute care hospital-based theory define the experience of a palliative care volunteer setting (7 participants, 5 Hospice and [1] acute-care hospital women); freestanding No details of the questions but ‘Participants had the community-funded opportunity to share their feelings, perceptions, and hospice (6 women); understanding of their role as a palliative care shelter-based hospice volunteer and its impact on their lives.’ facility for homeless (4 women) Respite care for Alzheimer’s Disease patients at home Harris [33] US Home care To determine differences and similarities in 1) the 15 - 5 paid workers, 5 Semi-structured individual service provided by volunteers and that provided by volunteers, 5 families interviews/no details paid workers; 2) characteristics brought to the served by participants respite situation by each group that had the potential to enhance the home care giving situation; and 3) quality of the relationship of the worker with the family ‘…subjects were probed for their perceptions of worker motivation, role, and competence’ no further details. Jack [3] Uganda* Home care To evaluate the impact of a palliative care Convenience sample of 21 community volunteer programme. patients, 32 volunteers, 11 Semi-structured individual interviews and focus groups/ hospice clinical staff thematic analysis Separate questions for each sample – too many to list here (18 in all) but all pragmatic questions about volunteers. Luijkx [5] Holland Home care To understand the experiences of families of Relatives of deceased terminally ill patients with volunteer support. former patients – 6 were Semi-structured individual interviews and focus interviewed and 22 took groups/no details What went right? What went wrong and what could be improved in the last phase of life? What roles do professional caregivers and volunteers play in palliative care? What are the implications of all of this for the quality of life of patients and their families? part in focus groups McKee [34] Canada Home care To understand the role of hospice volunteers are in 13 Volunteer coordinators Telephone rural communities. from all local independent interviews/grounded theory hospice volunteer visiting Questions: Sevigny [35] Canada programs Please describe what volunteers do in your community? What would be the ideal role of hospice volunteers in your community? What are the motivations and expectations of your volunteers, and how do you address those in your community? What differences do you perceive between hospice volunteering in rural as opposed to urban communities? Home care 58 volunteers and 6 To understand and describe volunteer practices Semi-structured individual coordinators within palliative care system. interviews and focus groups/thematic analysis approach to classify data Watts [36] UK Hospice ‘Questions were developed to tackle all important using a mixed categorization themes linked to the study’s aim: volunteers’ model (reference is to a text motivations, objectives, tasks, and experiences. in French) To understand the experience of becoming and being a hospice volunteer 10 volunteers at 1 hospice Focus group and 2 semistructured individual interviews/ thematically Used topic guide for both focus group and analysed using the topic interviews, but no further details. guide as a framework reference to Braum & Clark 2006 Weeks [37] Canada Home care in this research we endeavoured to gain a clearer 10 bereaved women Semi-structured individual understanding of what impact hospice palliative interviews/methodological care volunteers have on family caregivers. hermeneutics ‘Questions on accessing services, services received, satisfaction, and experiences related to the volunteer’… * Data collected in local language although published report is in English