TABLE 4.

Number of cigarettes per week by trimester per smoking group in the overall population, South Africa population, and Northern Plains population.

	Smoking exposure
	None	Quit early	Low continuous	Moderate/high continuous
Overall population
Average # cigarettes/week in trimester 1	0.011 ± 0.0012	8.38 ± 0.57	15.57 ± 0.24	47.73 ± 0.70
Average # cigarettes/week in trimester 2	0.0025 ± 0.0005	0.74 ± 0.13	15.77 ± 0.27	50.48 ± 0.81
Average # cigarettes/week in trimester 3	0.0077 ± 0.0010	0.11 ± 0.014	14.75 ± 0.26	46.94 ± 0.80
Average # cigarettes/week in pregnancy	0.0071 ± 0.0006	2.86 ± 0.19	15.36 ± 0.22	48.38 ± 0.67
South Africa
Average # cigarettes/week in trimester 1	0.008 ± 0.002	8.715 ± 0.574	16.003 ± 0.256	46.229 ± 0.732
Average # cigarettes/week in trimester 2	0.002 ± 0.001	0.100 ± 0.232	17.007 ± 0.283	50.156 ± 0.861
Average # cigarettes/week in trimester 3	0.006 ± 0.002	0.098 ± 0.021	15.999 ± 0.275	46.739 ± 0.828
Average # cigarettes/week in pregnancy	0.005 ± 0.001	2.971 ± 0.252	16.337 ± 0.229	47.708 ± 0.708
Northern Plains
Average # cigarettes/week in trimester 1	0.0142 ± 0.002	8.111 ± 0.829	13.079 ± 0.678	59.759 ± 2.036
Average # cigarettes/week in trimester 2	0.003 ± 0.001	0.053 ± 0.014	8.596 ± 0.678	53.044 ± 2.524
Average # cigarettes/week in trimester 3	0.009 ± 0.001	0.115 ± 0.021	7.491 ± 0.566	48.5883 ± 2.751
Average # cigarettes/week in pregnancy	0.009 ± 0.001	2.760 ± 0.276	9.722 ± 0.511	53.797 ± 2.041