Table 2

T-test results comparing exposed to unexposed participants before and after PSM

Before PSMp Value
Exposed n=215Unexposed n=185
MeanSDMeanSDα
Behaviour 3.430.903.240.000.04
Intention to wear a helmet 6.041.705.631.830.02
Planning 3.110.882.860.950.01
Action self-efficacy 3.540.783.540.980.01
 Outcome expectancies3.110.562.920.680.003
Intention to comply with the law 5.691.735.401.820.11
 Maintenance self-efficacy3.420.793.170.930.01
 Recovery self-efficacy3.510.813.320.890.03
 RR perception−0.461.25−0.431.260.81
 Absolute risk perception0.141.260.191.400.74
 Perceived risk of breaking the law3.291.943.451.890.41