After PSM | |||||
Exposed n=215 | Unexposed n=95 | p Value | |||
Mean | SD | Mean | SD | α | |
Behaviour | 3.44 | 0.90 | 3.49 | 0.84 | 0.61 |
Intention to wear a helmet | 6.04 | 1.70 | 6.17 | 1.32 | 0.44 |
Planning | 3.11 | 0.88 | 3.02 | 0.86 | 0.42 |
Action self-efficacy | 3.54 | 0.78 | 3.55 | 0.80 | 0.97 |
Outcome expectancies | 3.11 | 0.56 | 3.02 | 0.63 | 0.20 |
Intention to comply with the law | 5.69 | 1.73 | 5.87 | 1.61 | 0.39 |
Maintenance self-efficacy | 3.42 | 0.79 | 3.37 | 0.81 | 0.64 |
Recovery self-efficacy | 3.51 | 0.81 | 3.52 | 0.73 | 0.92 |
RR perception | −0.46 | 1.25 | −0.47 | 1.28 | 0.96 |
Absolute risk perception | 0.14 | 1.26 | 0.18 | 1.36 | 0.77 |
Perceived risk of breaking the law | 3.29 | 1.94 | 3.53 | 1.86 | 0.29 |
Factors within the best fitting model (model B) are printed bold. Exposed: people who answered at least one of the questions on campaign exposure with ‘yes.’ Unexposed: people who answered all questions on campaign exposure with ‘no.’
PSM, propensity score matching.