Table 2. Regression analysis of PMT variables and CED knowledge as predictors of passive behaviors .

Predictors	R 2 Change	R 2	R	P . value
Knowledge	0.081	0.081	0.285	0.0001
Response cost	0.053	0.134	0.366	0.0001
Perceived reward	0.013	0.147	0.383	0.050
Perceived severity	0.004	0.151	0.388	0.279
Perceived susceptibility	0.004	0.155	0.393	0.276
Self-efficacy	0.001	0.156	0.395	0.546
Response efficacy	0.0001	0.156	0.395	0.735
Fear	0.0001	0.156	0.395	0.952
Protection motivation	0.036	0.036	0.189	0.002