Demographic characteristics of participants
| Intervention (n=169) | Control (n=168) | |
| Mean age (years) | 38.8 (SD12.7) | 38.8 (SD 14.4) |
| Country of birth | ||
| Australia | 117 (69.2%) | 113 (67.3%) |
| Other | 52 (30.8%) | 55 (32.7%) |
| Language spoken at home | ||
| English | 147 (87.0%) | 140 (83.3%) |
| Other | 22 (13.0%) | 28 (16.7%) |
| Aboriginal or Torres Strait Islander | ||
| Neither | 167 (98.8%) | 165 (98.2%) |
| Aboriginal | 1 (0.6%) | 1 (0.6%) |
| Torres Strait Islander | 0 (0.0%) | 0 (0.0%) |
| Prefer not to answer | 1 (0.6%) | 2 (1.2%) |
| Sexuality | ||
| Heterosexual/straight | 151 (89.3%) | 140 (83.3%) |
| Bisexual | 2 (1.2%) | 7 (4.2%) |
| Homosexual/gay | 14 (8.3%) | 18 (10.7%) |
| Not sure | 1 (0.6%) | 1 (0.6%) |
| Other | 0 (0.0%) | 1 (0.6%) |
| Prefer not to say | 1 (0.6%) | 1 (0.6%) |
| Marital status | ||
| Married/de facto | 95 (56.2%) | 96 (57.1%) |
| Never married | 64 (37.9%) | 65 (38.7%) |
| Divorced/separated | 8 (4.7%) | 6 (3.6%) |
| Widowed | 1 (0.6%) | 1 (0.6%) |
| Prefer not to answer | 1 (0.6%) | 0 (0.0%) |
| Studying | ||
| No | 126 (74.6%) | 109 (64.9%) |
| Full-time student | 32 (18.9%) | 45 (26.8%) |
| Part-time student | 11 (6.5%) | 14 (8.3%) |
| Education | ||
| Year 11 or less | 12 (7.1%) | 13 (7.8%) |
| Year 12 or equivalent | 157 (92.9%) | 155 (92.3%) |
| Certificate/undergraduate diploma | 33 (19.4%) | 23 (14.2%) |
| Bachelor degree | 56 (33.1%) | 58 (34.5%) |
| Postgraduate qualification | 52 (30.8%) | 52 (31.0%) |
| Doctorate/PhD | 12 (7.1%) | 13 (7.7%) |
| Employment | ||
| Employed | 123 (72.8%) | 118 (70.2%) |
| Unemployed and looking for work | 17 (10.1%) | 23 (13.7%) |
| Neither working nor looking for work | 29 (17.2%) | 27 (16.1%) |