Table 3.

Multiple linear regression models

Covariates	B	S.E.	P value
Model A: outcome variable = mean score on 36-item questionnaire
# of HIV-infected patients in practice
< 75 (reference)	–	–	–
75–150	0.080	0.060	0.18
150–300	0.153	0.058	0.009
> 300	0.261	0.064	< 0.0001
Average time spent counseling patients about smoking cessation
< 3 min (reference)	–	–	–
3–5 min	0.171	0.048	0.0004
> 5 min	0.335	0.060	< 0.0001
History of formal smoking cessation training	0.145	0.050	0.004
Type of practice is primarily HIV care	0.189	0.085	0.03
Note: R2 of the model = 0.21, B = parameter estimate, S.E. = standard error of B
Model B: outcome variable = mean score on action subscale
# of HIV-infected patients in practice
< 75 (reference)	–	–	–
75–150	0.227	0.110	0.041
151–300	0.561	0.107	< 0.0001
> 300	0.533	0.120	< 0.0001
History of formal smoking cessation training	0.223	0.094	0.018
Mean score on beliefs subscale	0.385	0.078	< 0.0001
Mean score on ineffectiveness subscale	−0.371	0.062	< 0.0001
Note: R2 of the model = 0.30