Perceived risk, self-efficacy and knowledge scores over time and between group
| Month | Randomised group | N | Mean | SD | Min | Max | LS mean | LS mean difference | Lower 95% CL | Upper 95% CL | P-value for difference | P-value for difference rank analysis |
| Perceived risk | ||||||||||||
| 0 | Control | 268 | 6.9 | 1.9 | 0.0 | 10.0 | ||||||
| 0 | Intervention | 269 | 6.9 | 1.7 | 0.0 | 10.0 | ||||||
| 1 | Control | 223 | 6.7 | 2.0 | 0.0 | 10.0 | 6.8 | |||||
| 1 | Intervention | 234 | 7.0 | 1.7 | 2.0 | 10.0 | 7.1 | 0.2 | −0.0 | 0.5 | 0.0728 | 0.0836 |
| 12 | Control | 204 | 6.7 | 1.9 | 0.0 | 10.0 | 6.8 | |||||
| 12 | Intervention | 212 | 6.7 | 1.9 | 0.0 | 10.0 | 6.8 | 0.1 | −0.2 | 0.3 | 0.6452 | 0.4904 |
| Self-efficacy | ||||||||||||
| 0 | Control | 268 | 85.0 | 24.2 | 0.0 | 110.0 | ||||||
| 0 | Intervention | 269 | 87.3 | 24.6 | 0.0 | 110.0 | ||||||
| 1 | Control | 222 | 89.1 | 21.7 | 0.0 | 110.0 | 89.8 | |||||
| 1 | Intervention | 234 | 92.4 | 19.6 | 7.0 | 110.0 | 92.2 | 2.4 | −0.9 | 5.7 | 0.1583 | 0.1207 |
| 12 | Control | 204 | 90.7 | 20.0 | 0.0 | 110.0 | 91.7 | |||||
| 12 | Intervention | 212 | 94.5 | 17.5 | 0.0 | 110.0 | 94.1 | 2.4 | −1.0 | 5.9 | 0.1695 | 0.1683 |
| Knowledge | ||||||||||||
| 0 | Control | 268 | 9.0 | 5.4 | −8.0 | 19.0 | ||||||
| 0 | Intervention | 269 | 8.7 | 5.9 | −10.0 | 19.0 | ||||||
| 1 | Control | 223 | 9.4 | 5.4 | −9.0 | 19.0 | 9.5 | |||||
| 1 | Intervention | 234 | 9.4 | 6.2 | −13.0 | 21.0 | 9.6 | 0.1 | −0.8 | 1.1 | 0.7769 | 0.4583 |
| 12 | Control | 204 | 8.8 | 5.9 | −11.0 | 19.0 | 8.9 | |||||
| 12 | Intervention | 212 | 9.7 | 6.1 | −8.0 | 19.0 | 9.9 | 1.0 | −0.0 | 2.0 | 0.0509 | 0.0271 |
CL, confidence limit; LS, least square; Max, maximum; Min, minimum.