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

Walden and Earleywine Harm Reduction Journal 2008 5:20   doi:10.1186/1477-7517-5-20

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