Comparison of CO breath testing and women's self-reporting of smoking behaviour for identifying smoking during pregnancy

Table 1 CO breath test result and self reported smoking status for all subjects

CO level	Non smokers (number)	Smokers (number)				Total number
		0–10	11–20	21–30	>30
0	6	0	0	0	0	6
1	1790	70	6	0	0	1866
2	66	11	4	0	0	81
3	59	26	4	0	0	89
4	28	23	2	1	0	54
5	17	15	9	0	0	41
6	4	20	2	1	0	27
7	5	14	8	3	0	30
≥8	27	177	114	30	6	354
Total	2002					2548

ISSN: 1747-597X