Characteristics of participants at baseline, comparing those who completed survey 3 and those lost to follow-up
| Characteristic | All participants at baseline (n=322) | Participants retained (n=284) | Participants lost to follow-up (n=38) |
| Age group (years)* | |||
| 16–21 | 139 (43.2) | 139 (48.9) | – |
| 22–25 | 133 (41.3) | 133 (46.8) | – |
| Missing | 50 (15.5) | 12 (4.2) | 38 (100) |
| Relationships | |||
| Never married | 243 (75.5) | 214 (73.4) | 29 (76.3) |
| Living with partner | 64 (11.2) | 56 (19.7) | 8 (21.1) |
| Married | 11 (3.4) | 10 (3.5) | 1 (2.6) |
| Separated/divorced | 4 (1.2) | 4 (1.4) | 0 (0) |
| >1 sexual partner† | 34 (10.6) | 29 (10.2) | 5 (13.2) |
| Pregnancy history | |||
| Previous pregnancy/ies | 22 (6.8) | 17 (6.0) | 5 (13.2) |
| Unintended pregnancy/ies | 17 (5.3) | 15 (5.3) | 2 (5.3) |
| Work status: | |||
| Student | 195 (60.6) | 175 (61.6) | 20 (52.6) |
| Full-time (30+ hours/week) | 49 (15.2) | 41 (14.4) | 8 (21.1) |
| Part-time (<30 hours/week) | 61 (18.9) | 53 (18.6) | 8 (21.1) |
| Unemployed, or unable to work due to disability or illness | 15 (4.7) | 13 (4.6) | 2 (5.3) |
| Other | 2 (0.6) | 2 (0.7) | 0 (0.0) |
| Born in Australia | 259 (80.4) | 226 (79.6) | 33 (86.6) |
| Location | |||
| Metropolitan | 260 (80.8) | 230 (81.0) | 30 (78.9) |
| Rural | 62 (19.2) | 54 (19.0) | 8 (21.1) |
| State | |||
| Victoria | 206 (64.0) | 183 (64.4) | 23 (60.5) |
| Queensland | 44 (13.7) | 37 (13.0) | 7 (18.4) |
| New South Wales | 32 (9.9) | 27 (9.5) | 5 (13.2) |
| Other | 40 (12.4) | 37 (12.7) | 3 (7.9) |
| Social security | |||
| Social security payments | 106 (32.9) | 98 (34.5) | 9 (21.1) |
| Healthcare Card‡ | 156 (48.4) | 140 (49.3) | 16 (42.1) |
Results reported as number (percentage). Logistic regression found no difference in the characteristics of participants who completed the study and those lost to follow-up on any demographic variables.
*Age not collected at baseline.
†>1 sexual partner (yes/no) collected at baseline only.
‡Available to people who meet eligibility criteria for certain welfare payments, allowing access to cheaper medicines, healthcare services and other concessions.