Characteristics of subjects
| Occupation | Source of sample |
Surveyed (n) |
Participated (n) |
Response rate (%) |
Women (n (%)) |
Age (median, IQR1-150) |
| Firefighters | All new recruits from four counties | 166 | 163 | 98 | 1 (0.6) | 25 (23–27) |
| Retail workers | All workers at a newly opened store | 153 | 114 | 75 | 73 (64.0) | 35 (26–43) |
| Shipbuilders | All new apprentices from a sample of courses | 113 | 113 | 100 | 2 (1.8) | 17 (16–18) |
| Dentists | All final year students from two universities | 117 | 112 | 96 | 55 (49.1) | 23 (22–24) |
| Army infantry | Two samples of 50 new recruits | 100 | 100 | 100 | 0 (0) | 18 (17–20) |
| Army officers | Three samples of 34 new recruits | 102 | 96 | 94 | 8 (8.3) | 23 (22–24) |
| Nurses | All final year students from one university | 106 | 87 | 82 | 81 (93.1) | 24 (22–27) |
| Podiatrists | All final year students from two universities | 84 | 79 | 94 | 64 (81.0) | 24 (21–30) |
| Postal workers | All workers at a newly opened branch | 83 | 70 | 84 | 6 (8.6) | 34 (31–41) |
| Army clerks | All new recruits on three courses | 70 | 69 | 99 | 47 (68.1) | 20 (19–23) |
| Police officers | All new recruits on three courses | 44 | 44 | 100 | 8 (18.2) | 27 (24–29) |
| Forestry workers | All final year students from one college | 48 | 34 | 71 | 2 (5.9) | 22 (20–23) |
| Total | 1186 | 1081 | 91 | 347 (32.1) | 20 (23–27) |
↵1-150 Interquartile range (25th–75th percentile).