Nicotine and cotinine in mothers' and infants' hair

Table 1: Smoking patterns among women in the study
No. of women who were active smokers	36
No. of cigarettes smoked per day Mean (and standard deviation [SD]) Range	11.4 (9) 1-40
No. of women who quit smoking during first trimester	4
No. who continued to smoke throughout pregnancy	32
No. of women who were sole smokers in their household	20
No. of cigarettes smoked per day by these women, mean (and SD)	12.67 (7.7)
No. of women who smoked and lived with household members (usually their spouse) who smoked	16
No. of cigarettes smoked per day by these women, mean (and SD)	10.8 (10.6)
No. of women who were Light smokers (1-10 cigarettes/d) Moderate smokers (11-20 cigarettes/d) Heavy smokers (> 20 cigarettes/d)	21 9 6