. 2016 Dec 15;6:39055. doi: 10.1038/srep39055

Table 1. Multiple linear regression results using log 8-iso-PGF_2α as dependent variable and log ethyl sulfate together with trans-3′-hydroxycotinine as independent variables.

Predictors	Total (n = 38)		Weekday (n = 19)		Weekend (n = 19)
Predictors	Regression coefficient (95% confidence interval)	P value	Regression coefficient (95% confidence interval)	P value	Regression coefficient (95% confidence interval)	P value
Constant	0.32 (0.15, 0.48)	<10⁻³	0.29 (0.05, 0.54)	0.023	0.35 (0.08, 0.62)	0.015
Log (ethyl sulfate)	−0.13 (−0.35, 0.10)	0.268	−0.20 (−0.59, 0.20)	0.318	−0.08 (−0.44, 0.29)	0.654
Trans-3′-hydroxycotinine	0.19 (0.12, 0.27)	<10⁻⁴	0.22 (0.11, 0.34)	0.001	0.17 (0.04, 0.30)	0.016
	R² = 0.42, adjusted R² = 0.39, p < 10⁻⁴		R² = 0.49, adjusted R² = 0.44, p = 0.003		R² = 0.36, adjusted R² = 0.27, p = 0.037

Table 1. Multiple linear regression results using log 8-iso-PGF2α as dependent variable and log ethyl sulfate together with trans-3′-hydroxycotinine as independent variables.