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. 2019 Dec 5;14(12):e0225661. doi: 10.1371/journal.pone.0225661

Table 3. A comparison of mental health research conducted in farming populations worldwide (n = 341).

Studies may have reported on more than one mental health outcome.

Suicide Stress Depression Anxiety Resilience Mortality Burnout Mental Health Service Non-specified mental health outcome
Publication range 1990–2017 1979–2017 1980–2107 1980–2017 1980–2017 2002–2016 2016–2017 1998–2016 1979–2017
Number of studies 113 (33.1) 143 (41.9) 111 (32.6) 51 (15.0) 20 (5.9) 7 (2.1) 2 (0.6) 20 (5.9) 25 (7.3)
Population
Farm type Animal farming 1 (0.9) 37 (25.9) 9 (8.1) 7 (13.7) 5 (25.0) 0 1 (50.0) 2 (10.0) 4 (16.0)
Crop/Horticultue farming 14 (12.4) 25 (17.5) 12 (10.8) 6 (11.8) 3 (15.0) 2 (28.6) 0 0 1 (4.0)
Both 9 (8.0) 14 (10.0) 6 (5.4) 3 (5.9) 0 1 (14.3) 0 0 2 (8.0)
No reported farm type 89 (78.8) 67 (46.9) 84 (75.7) 35 (68.6) 12 (60.0) 4 (57.1) 1 (50.0) 18 (90.0) 18 (72.0)
Individual level1
Farmer: dairy 9 (8.0) 26 (18.2) 9 (8.1) 4 (7.8) 3 (15.0) 0 1 (50.0) 1 (5.0) 4 (16.0)
Farmers: beef 6 (5.3) 14 (9.8) 7 (6.3) 3 (5.9) 2 (10.0) 0 0 0 2 (8.0)
Farmer: swine 4 (3.5) 7 (4.9) 1 (0.9) 0 0 0 0 1 (5.0) 4 (16.0)
Farmer: small ruminants 8 (7.1) 11 (7.7) 3 (2.7) 0 1 (5.0) 0 0 0 2 (8.0)
Farmer: poultry 5 (4.4) 5 (3.5) 2 (1.8) 1 (2.0) 0 0 0 0 3 (12.0)
Farmer: aquaculture 2 (1.8) 2 (1.4) 1 (0.9) 0 0 0 0 0 0
Farmer: crops 23 (20.4) 21 (14.7) 14 (12.6) 6 (11.8) 3 (15.0) 3 (42.9) 0 0 3 (16.0)
Farmer: horticulture 8 (7.1) 11 (7.7) 6 (5.4) 3 (5.9) 2 (10.0) 0 0 0 0
Farmer: other commodity2 3 (2.7) 0 (0.0) 1 (0.9) 1 (2.0) 0 0 0 0 1 (4.00)
Farm families 7 (6.2) 36 (25.2) 18 (16.2) 5 (9.8) 8 (40.0) 1 (14.3) 0 8 (40.0) 3 (12.0)
Migrant farm workers 2 (1.8) 28 (19.6) 29 (26.1) 15 (29.4) 1 (5.0) 0 0 1 (5.0) 4 (16.0)
Permanent farm workers 17 (15.0) 12 (8.4) 10 (9.0) 4 (7.8) 0 3 (42.9) 0 2 (10.0) 2 (8.0)
Female farmers 2 (1.8) 7 (4.9) 10 (9.0) 5 (9.8) 2 (10.0) 0 0 0 0
Male farmers 6 (5.3) 2 (1.4) 5 (4.5) 2 (3.9) 0 0 0 1 (5.0) 0
Study Type
Quantitative 72 (63.7) 101 (70.6) 93 (83.7) 43 (84.3) 12 (60.0) 3 (42.9) 2 (100.0) 8 (40.0) 16 (80.0)
Qualitative 20 (17.7) 22 (15.4) 4 (3.6) 3 (5.9) 4 (20.0) 1 (14.3) 0 3 (15.0) 5 (20.0)
Mixed methods 5 (4.4) 11(7.7) 5 (4.5) 2 (3.9) 2 (10.0) 1 (14.3) 0 5 (25.0) 3 (12.0)
Review/governmental report 16 (14.2) 9 (6.3) 9 (8.1) 3 (5.9) 2 (10.0) 2 (28.6) 0 4 (20.0) 1 (4.0)
Study Design
Cross-sectional 26 (23.0) 61 (42.7) 67 (60.4) 32 (62.8) 10 (50.0) 0 2 (100.0) 2 (10.0) 13 (52.0)
Case-control 13 (11.5) 5 (3.5) 2 (1.8) 1 (2.0) 0 0 0 0 0
Cohort 38 (33.6) 30 (21.0) 20 (18.0) 7 (13.7) 1 (5.0) 3 (42.9) 0 1 (5.0) 2 (8.0)
Quasi-experimental 0 2 (1.4) 1 (0.9) 3 (5.9) 0 0 0 0
Randomized Control Trial 0 0 2 (1.8) 1 (2.0) 0 0 0 2 (10.0) 0
Phenomenology 10 (8.9) 25 (17.5) 8 (7.2) 3 (5.9) 6 (30.0) 2 (28.6) 0 2 (10.0) 7 (28.0)
Ethnography 2 (1.4) 0 0 0 0 0 0 0
Case Study 4 (3.5) 0 0 0 0 0 0 0 0
Service Evaluation 1 (0.9) 2 (1.4) 1 (0.9) 1 (2.0) 0 0 0 7 (35.0) 0
Scale development/
validity testing
0 2 (1.4) 1 (0.9) 0 1 (5.0) 0 0 0 1 (4.0)
Theoretical framework development 2 (1.8) 1 (0.7) 0 0 0 0 0 1 (5.0) 1 (4.0)
Literature Review 19 (16.8) 13 (9.1) 9 (8.11) 3 (5.9) 2 (10.0) 2 (28.6) 0 5 (25.0) 1 (4.0)

Note: Studies could contribute to more than one farm type or individual level. Therefore, columns may not add to 100%.

1More than one individual level group could be investigated within one study. Therefore, numbers will not add to 100%.

2Other animal farmers included equine, livestock (unidentified), and worms (silk and compost).