Table 2.
Nicotine Metabolite Ratio (NMR) R2 = 0.076a; P <0.001 |
|||||
---|---|---|---|---|---|
Predictor | B | Standard Error | β | P value | % Variationb |
Ethnicityc | 0.071 | 0.011 | 0.162 | <0.001 | 2.3 |
Genderd,e | 0.057 | 0.010 | 0.136 | <0.001 | 1.7 |
Birth control pill use | 0.036 | 0.050 | 0.017 | 0.47 | 0.03 |
Hormone replacement therapy use | 0.114 | 0.054 | 0.050 | 0.036 | 0.24 |
Body mass index | −0.003 | 0.001 | −0.108 | <0.001 | 1.1 |
Alcohol use (# drinks/week) | 0.003 | 0.001 | 0.070 | 0.004 | 0.46 |
Cigarettes per day | 0.002 | 0.001 | 0.062 | 0.012 | 0.36 |
Together the predictors account for 7.6% of the variation in NMR
Calculated by squaring the part correlation coefficient (not shown), and multiplying by 100
African Americans and Caucasians were coded as ‘0’ and ‘1’, respectively, in the model
Males and females were coded as ‘0’ and ‘1’, respectively, in the model
When we restricted the model to females only (N=756), to further examine the effect of birth control pill and hormone replacement therapy use, the predictors (gender is excluded) together explained 6.6% of the variation in NMR. The standardized beta values for birth control pill and hormone replacement therapy use were 0.025 (P=0.48) and 0.069 (P=0.052), respectively, in the female-only group. They uniquely contributed 0.06% and 0.48% of the variation in NMR, respectively, in females.