Table 2 Papers from grey/non-health literature from purposive search (n=13)

Robertson/IOM (2011) [36]

Qualitative in-depth interviews, focus groups (2008-9)

Purposive (via assistance organizations) and snowball sampling

N=8 Fishermen (Trafficked), N=9 Focus groups (6-15 Burmese/Cambodian fishermen each), N=63+ Key informants

Violence, Adverse conditions

Thailand

Fair

Brennan/Solidarity Centre (2009) [30]

Qualitative in-depth interviews (some quantitative findings) (2008)

Purposive sampling via assistance organization

N=25 Fishermen (some Trafficked, 24 Burmese, 1 Cambodian, 19 Short-haul, 11 Long-haul boats)

Violence, Adverse conditions, Mental health (qualitative description)

Thailand

Fair

UNIAP (2009) [46]

Qualitative in-depth interviews and case analysis (2007-8)

Purposive sampling via assistance organizations

N=49 Cambodian fishermen (Trafficked)

Violence,

Adverse conditions

Thailand, Malaysia

Fair

Pearson/ILO (2006) [45]

Cross-sectional survey, Qualitative in-depth interviews (2005)

Snowball sampling (fishermen), Simple random sampling (employers)

N=21 Burmese fishermen (some Forced labour), N=40 Thai employers

Violence, Adverse conditions,

Treatment seeking behaviour

Thailand

Fair

Fujita (2010) [56]

Cross-sectional household survey (2009)

Purposive sampling via assistance organization

N=19 Burmese fishermen households

Adverse conditions

Thailand

Poor/Fair

ILO/ARCM (2013) [14]

Cross-sectional survey (2012)

Stratified, multi-stage convenience sampling

N=596 Fishermen (some Forced Labour, 306 Burmese, 241 Cambodian, 49 Thai, 185 Short-haul, 106 Long-haul)

Occupational health – injuries, Violence, Adverse conditions

Thailand

Good

Baker/UNACT (2015) [39]

Cross-sectional surveys (2009, 2012, 2013)

Systematic random sampling

N=125 Cambodian fishermen

(Deportees, some Trafficked)

Occupational health – work safety, Violence, Adverse conditions

Thailand, Cambodia

Good

Verite (2015) [34]

Qualitative in-depth interviews (year unclear)

Unclear/Not specified (could be purposive)

Unspecified no. Cambodian/Burmese fishermen (some Forced Labour), Key informants

Occupational health – hazards, Adverse conditions

Thailand

N/A

Yea (2014) [32]

Qualitative in-depth interviews, case file review (2010-14)

Unclear (could be purposive, based on 2012 study)

N=24 Fishermen (Trafficked, 3 Cambodian, 21 Filipino, 1 Indonesian)

N=63 case files of Filipino fishermen

Occupational health – hazards, injuries, Adverse conditions

Violence

Taiwan, Singapore

Fair

Day/HAGAR (2015) [37]

Qualitative in-depth interviews, focus groups (2014-15)

Purposive sampling via assistance organizations

N=8 Cambodian fishermen (Trafficked), N=1 Focus group (10 Cambodian fishermen), N=33 Key informants

Occupational health – injuries, Adverse conditions, Violence, Mental health (qualitative description)

Thailand, Indonesia, Malaysia

Fair/Good

EJF (2013) [52]

Qualitative in-depth interviews (2013)

Purposive sampling via assistance organization

N=6 Burmese fishermen (Trafficked)

Adverse conditions, Violence

Thailand

N/A

Stringer et al. (2016)^a [38]

Qualitative in-depth interviews (2011-14)

Purposive (via assistance organization) and snowball sampling

N=292 Fishermen (Forced Labour, from Indonesia, Myanmar, China, Philippines), Unspecified no. of Key informants

Occupational health – injuries, Adverse conditions, Violence

New Zealand

Fair/Good

Surtees (2014) [33]

Qualitative in-depth interviews, case file review (2013-14)

Purposive (via assistance organizations) and snowball sampling

N=11 Cambodian fishermen (Trafficked)

N=20 case files of Cambodian fishermen, N=42 Key informants

Occupational health – hazards, injuries, Violence, Adverse conditions, Mental health (qualitative description)

South Africa

Fair/Good