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Table 2

Regression model results (R2, β, and Ps for each variable in the model) for different combinations of independent variables in relation to the log toenail nicotine levels (ng/mg hair) as the dependent variable

n                  aMain:b β (P)Active:c β (P)Passive: β (P)
Model 1, R2 = 0.62 104 1.15 (<0.0001)   
Model 2, R2 = 0.64 102  1.05 (<0.0001) 0.69 (0.0004) 
Model 3, R2 = 0.65 102  0.99 (<0.0001) 0.41 (0.005) home 
    0.15 (0.24) work 
Model 4, R2 = 0.59 103  1.05 (<0.0001)  
Model 5,d R2 = 0.20 53   0.93 (0.0005) 
Model 6,d R2 = 0.27 53   0.54 (0.008) home 
    0.38 (0.02) work 
Model 7,e R2 = 0.16 48  0.51 (0.007) 0.46 (0.08) 
Model 8,e R2 = 0.12 48  0.52 (0.007)  
n                  aMain:b β (P)Active:c β (P)Passive: β (P)
Model 1, R2 = 0.62 104 1.15 (<0.0001)   
Model 2, R2 = 0.64 102  1.05 (<0.0001) 0.69 (0.0004) 
Model 3, R2 = 0.65 102  0.99 (<0.0001) 0.41 (0.005) home 
    0.15 (0.24) work 
Model 4, R2 = 0.59 103  1.05 (<0.0001)  
Model 5,d R2 = 0.20 53   0.93 (0.0005) 
Model 6,d R2 = 0.27 53   0.54 (0.008) home 
    0.38 (0.02) work 
Model 7,e R2 = 0.16 48  0.51 (0.007) 0.46 (0.08) 
Model 8,e R2 = 0.12 48  0.52 (0.007)  
a

Some had missing information.

b

This refers to the four main exposure categories of the study (never exposed, passively exposed, actively exposed, and actively and positively exposed).

c

This represents the categories of active cigarette smoking.

d

Excluding active smokers.

e

Excluding nonactive smokers.

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