Table 2.
Multivariable analysis of factors associated with contact or participation
| Multivariable model | Contacted (n = 1656) |
Participated (n = 1618) | Participation after contact (n = 599) |
|---|---|---|---|
| Odds ratio (95% CI) | Odds ratio (95% CI) | Odds ratio (95% CI) | |
| Sex | |||
| Male | Reference | Reference | Reference |
| Female | 1.51 (1.20, 1.91) | 1.83 (1.39, 2.42) | 1.31 (0.87, 1.97) |
| Intervention group | |||
| Control | Reference | Reference | Reference |
| Moderate | 1.43 (1.09, 1.88) | 1.68 (1.22, 2.32) | 1.25 (0.76, 2.04) |
| High | 1.60 (1.20, 2.14) | 1.68 (1.19, 2.36) | 1.35 (0.82, 2.22) |
| Participant 2005 follow-up | |||
| No | Reference | Reference | Reference |
| Yes | 5.09 (3.67, 7.06) | 4.22 (2.85, 6.25) | 1.87 (1.15, 3.04) |
| Mobile number | |||
| No | Reference | Reference | NA |
| Yes | 2.25 (1.57, 3.23) | 1.43 (0.96, 2.11) | NA |
| Landline number | |||
| No | Reference | Reference | NA |
| Yes | 1.96 (1.04, 3.67) | 2.45 (1.02, 5.86) | NA |
| Telephone/s disconnected | |||
| No | NA | Reference | NA |
| Yes | NA | 0.44 (0.31, 0.64) | NA |
| First point of contact | |||
| Parent/Sibling | NA | NA | Reference |
| `Participant | NA | NA | 4.84 (2.89, 8.10) |
| Contact method | |||
| Phone: Landline | NA | NA | Reference |
| Phone: Mobile | NA | NA | 1.54 (0.83, 2.84) |
| Letter: Old address | NA | NA | 6.53 (3.35, 12.74) |
| Letter: Electoral roll address | NA | NA | 5.77 (2.85, 11.67) |
| Facebook: Message | NA | NA | 2.01 (0.81, 4.98) |
| Facebook: Advertisement/Pagea | NA | NA | 2.72 (0.84, 8.81) |
| Word of mouth | NA | NA | 2.06 (0.37, 11.59) |
aAll participants contacted through the Facebook page participated, therefore this group was combined with those contacted through the Facebook advertisement