Smoking intensity and urinary nicotine metabolites by socioeconomic status in the Heinz Nixdorf Recall study

BMC Public Health

Table 3 Estimated parameters of multiple linear regression for potential predictors of urinary cotinine [μg/L] in current smokers

Men (n = 395^a)	\(\hat{\boldsymbol{\upbeta}}\)	95% LCL^b	95% UCL^b	Adjusted R²
Intercept	1180.32	− 954.12	3314.75	0.333
Ln (cigarettes per day)	1318.20	1028.34	1608.06
Age [years/10]	− 472.02	− 762.03	−182.00
Creatinine in urine [mg/L]	1.54	1.20	1.87
ISEI^c	−59.12	− 171.30	53.05
Women (n = 341^a)
Intercept	506.29	− 1879.78	2892.37	0.333
Ln (cigarettes per day)	1378.95	1047.38	1710.52
Age [years/10]	− 306.34	− 639.12	26.44
Creatinine in urine [mg/L]	1.76	1.37	2.16
ISEI^c	−176.81	−300.91	−52.71

^a 42 men and 45 women excluded because of missing values
^b Lower and upper confidence limit
^c International Socio-Economic Index of occupational status, continuous variable with range divided by 10: 1 (low) to 9 (high)

ISSN: 1471-2458