Table 2.

Summary of Regression Analysis for Variables Predicting Respiratory Symptoms (N = 1868)

Variable	B	SE B	β	R2	R2-Change
Step 1				0.124	0.107***
Respondent sex	0.219	0.047	0.102***
Respondent age	-0.006	0.002	-0.063*
Ever smoked cigarettes	0.115	0.064	0.057
Cigarettes smoked per day	0.028	0.003	0.268***
Step 2				0.134	0.010***
Frequency of use (days per month)	0.194	0.088	0.062*
Step 3				0.140	0.005**
Quarter ounces per month	0.297	0.094	0.087**
Step 4				0.142	0.002*
Usual intoxication intensity	0.073	0.023	0.091**
Step 5				0.144	0.002*
Maximum intoxication intensity	-0.059	0.025	-0.074**
F (8,1868) = 39.267, p < 0.001.

Note. *p < 0.05, **p < 0.01, ***p < 0.001