Details of the employed interventions from studies included in the systematic review
| No | Author (year) | Location | Economic status | Training cohort size | Training cohort occupations | Training course content | Delivery method | Length | Course type | Research design |
| 1 | Abas et al (2016) | Zimbabwe | Low income | 40–60 | Community health workers | Specific: friendship bench | Combination | 8 days | Continuous | Postintervention |
| 2 | Abayomi et al (2012) | Nigeria | Lower middle income | 31 | Volunteers | General | Didactic | 6 weeks | Sessional | Pre–post intervention |
| 3 | Adebowale et al (2015) | Nigeria | Lower middle income | 80 | Community health workers, nursing professionals | General (mhGAP) | Combination | 3 days | Continuous | Pre–post intervention |
| 4 | Alonso et al (2014) | Sierra Leone | Low income | 3 | Nursing professionals, social work and counselling professionals | General (mhGAP) | Combination | 8 weeks | Continuous | Postintervention (Research Methods (RM)) |
| 5 | Armstrong et al (2010) | Australia | High income | 30 | Social work, counselling professionals | Specific: cognitive behavioural therapy | Combination | 3 weeks | Sessional | Pre–post intervention (Randamised Controlled Trial (RCT)) |
| 6 | Armstrong et al (2011) | India | Lower middle income | 70 | Community health workers | General (+MHFA) | Combination | 4 days | Continuous | Pre–post intervention (RM) |
| 7 | Bowers and Burnett (2009) | UK | High income | 26 | Community health workers | Specific: New Ways of Working Framework | Didactic | 4 months | Sessional | Pre–post intervention |
| 8 | Chew-Graham et al (2014) | UK | High income | 68 | Generalist medical practitioners, nursing professionals, non-medical staff, social work and counselling professionals | Specific: access to mental health in primary care programme training plus
(advanced training) | Didactic | Variable (1–7 sessions over unknown period) | Sessional | Postintervention |
| 9 | Chibanda et al (2016) | Zimbabwe | Low income | 96–288 | Community health workers | Specific: friendship bench | Combination | 9 days | Sessional | Pre–post intervention (RM; RCT) |
| 10 | Church et al (2010) | Canada | High income | 125 | Generalist medical practitioners, nursing professionals, non-medical staff, paramedical practitioners, social work and counselling professionals | Specific: rural mental health interprofessional training programme | Interactive | 4 months | Sessional | Pre–post intervention (RM) |
| 11 | Cook et al (2017) | USA | High income | 394 | Generalist medical practitioners, nursing professionals, non-medical staff, social work and counselling professionals | Specific: motivational interviewing | Combination | 4–8 hours | Sessional | Postintervention |
| 12 | Ekers et al (2013) | UK | High income | 10 | Nursing professionals | Specific: behavioural activation | Combination | 5 days | Continuous | Postintervention |
| 13 | Ferraz and Wellman (2009) | UK | High income | 66 | Health service managers, volunteers | Specific: solution focused brief therapy | Interactive | 2 days | Continuous | Pre–post intervention (RM) |
| 14 | Hofmann-Braussard et al (2017) | India | Lower middle income | 56 | Community health workers | General (+MHFA + Stigma) | Combination | 4 days | Sessional | Pre–post intervention (Controlled Trial (CT)) |
| 15 | Hossain et al (2010) | Australia | High income | 32 | Non-medical staff | Emergency mental health: MHFA | Didactic | 2 days | Continuous | Postintervention |
| 16 | Jenkins et al (2013) | Kenya | Lower middle income | 98 | Community health workers | General | Combination | 5 days | Continuous | Postintervention (RM); RCT) |
| 17 | Jordans et al (2012) | Nepal | Low income | 109 | Non-medical staff | Emergency mental health: disaster settings | Combination | 2 days | Continuous | Pre–post intervention (RM) |
| 18 | Kauye et al (2014) | Malawi | Low income | 22 | Community health workers | General | Combination | 5 days | Continuous | Pre–post intervention (RCT) |
| 19 | Lam et al (2016) | Hong Kong (China) | High income | 151 | Community health workers | General | Interactive | 10 days | Sessional | Pre–post intervention |
| 20 | Li et al (2014) | China | Upper middle income | 99 | Community health workers | General (+Stigma) | Didactic | 1 day | Continuous | Pre–post intervention |
| 21 | MacCarthy et al (2013) | Canada | High income | >1400 | Generalist medical practitioners | Specific: cognitive behavioural interpersonal skills (+MHFA) | Combination | 3 days | Sessional | Postintervention (RM) |
| 22 | Morawska et al (2013) | Australia | High income | 458 | Consumers or carers, health service managers, non-medical staff | Emergency mental health: MHFA | Interactive | 2 days | Continuous | Pre–post intervention (RM) |
| 23 | Paudel et al (2014) | India | Lower middle income | 24 | Community health workers | General | Interactive | Not Declared (ND) | Not Declared (ND) | Postintervention |
| 24 | Ravitz et al (2013) | Canada | High Income | 93 | Community health workers, nursing professionals, non-medical staff | Specific: cognitive behavioural therapy, interpersonal psychotherapy, motivational interviewing, dialectical behaviour therapy | Interactive | 5 weeks | Sessional | Pre–post intervention |
| 25 | Ruud et al (2016) | Norway | High income | >3500 | Community health workers, generalist medical practitioners, nursing professionals, social work and counselling professionals | General | Combination | 2 years | Sessional | Postintervention |
| 26 | Sadik et al (2011) | Iraq | Upper middle income | 317 | Community health workers, generalist medical practitioners, nursing professionals, social work and counselling professionals | General | Combination | 10 days | Continuous | Pre–post intervention (RM) |
| 27 | Siriwardhana et al (2016) | Sri Lanka | Lower middle income | 12 | Generalist medical practitioners | General (mhGAP) | Combination | 3 days | Continuous | Pre–post intervention |
| 28 | Usher et al (2014) | Pacific Island Small States | Aggregates | 18 | Community health workers, nursing professionals | General (mhGAP) | Combination | 4 weeks | Continuous | Pre–post intervention |
| 29 | Wright et al (2014) | Malawi | Low income | 271 | Community health workers | General (mhGAP) | Combination | 6 months | Sessional | Pre–post intervention (RM) |
mhGAP, Mental Health Gap Action Programme.