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

BMC Public Health

Table 2 Cigarettes per day (CPD), urinary cotinine [μg/L], and correlations of ln (CPD) and cotinine in subgroups

	Men						Women
	n	CPD^b	IQR	Cotinine^b	IQR	r^a	n	CPD^b	IQR	Cotinine^b	IQR	r^a
Total	437	20	12–25	3652	2279–5422	0.40	386	19	10–20	3127	1692–4920	0.40
Age [years]
< 50	80	20	15–25	4140	2778–5219	0.43	87	20	15–22	3497	1660–5564	0.37
50–59	191	20	15–30	4329	2699–6112	0.31	194	19	10–20	3086	1776–5170	0.38
60–69	136	19	10–25	3186	1802–4674	0.42	84	15	9–20	3082	1701–4512	0.39
> =70	30	11	6–20	2155	1418–4078	0.42	21	10	5–15	1867	633–2544	0.62
ISEI
High	85	19	10–30	3593	2199–5035	0.48	71	19	10–25	2566	1727–4221	0.47
Intermediate	249	20	12–25	3716	2458–5652	0.39	231	19	10–20	3177	1615–5249	0.43
Low	99	20	11–25	3493	1925–4992	0.35	77	19	10–20	3323	1987–4701	0.28
Missing	4	18	14–25	3895	1844–5640		7	20	18–20	3683	2553–4789
Blue−/white-collar occupation
White collar	239	20	12–30	3793	2315–5520	0.41	320	19	10–20	2927	1666–4840	0.41
Blue collar	192	20	12–25	3489	2180–5191	0.39	59	19	12–25	3542	1987–5617	0.37
Missing	6	18	15–20	3895	2998–7146		7	20	18–20	3683	2553–4789
Education [years]
> =18	34	20	10–30	3772	2159–5210	0.44	24	20	9–20	1995	1136–2672	0.45
14–17	107	20	15–25	3736	2390–6345	0.43	50	17	10–20	2702	1692–4182	0.42
11–13	262	20	12–25	3654	2198–5227	0.40	256	19	10–20	3155	1713–5084	0.41
< =10	33	20	15–30	3493	2283–5424	0.19	56	19	11–20	3760	2445–5493	0.37
Missing	1	30	30–30	6904	6904–6904		0

IQR interquartile range, ISEI International Socio-Economic Index of occupational status
^a Pearson correlation coefficient for ln (CPD) and cotinine
^b Median

ISSN: 1471-2458