Table 3. Results of Multiple Linear Regression Analysis.

	Unstandardized Coefficients		Standardized β	P Value
	B	S.E
Step 1
Attitude	0.27	0.03	-0.40	< 0.001
PBC	1.05	0.14	-0.38	< 0.001
Subjective norms	0.39	0.09	-0.24	< 0.001
Model R2 = 76%				< 0.001
Step 2
Attitude	0.21	0.04	-0.31	< 0.001
PBC	1.12	0.14	-0.40	< 0.001
Subjective norms	0.36	0.09	-0.23	< 0.001
refusal skill	0.16	0.07	-0.11	< 0.02
Model R2 = 78.2%				< 0.001