American Association for Cancer Research

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 ^a	Main:^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 ^a	Main:^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)

Some had missing information.

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

This represents the categories of active cigarette smoking.

Excluding active smokers.

Excluding nonactive smokers.

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