Table 1.

Characteristics of the study population (count, mean ± s.d., or percent, as indicated)

	Non-Smoking Mothers	Smoking Mothers	P-Value
Number of Subjects	15	15
Maternal Age (yrs)	29.8 ± 5.5	26.2 ± 6.5	0.12
Caucasian/White Race	46.7%	60.0%	0.62
Hispanic Ethnicity	26.7%	20.0%	0.68
Gravidity/Total Pregnancies			0.26
1	26.7%	20.0%
2	53.3	20.0
3	6.7	20.0
≥ 4	13.3	33.3
Unknown	0.0	6.7
Parity/Prior Births			0.06
0	33.3%	40.0%
1	60.0	20.0
≥ 2	6.7	33.3
Unknown	0.0	6.7
Maternal Body mass index	30.1 ± 5.4	32.4 ± 6.8	0.33
Evidence of Alcohol or Drugs at Delivery	0.0%	33.3%	0.04
Infant Sex			0.07
Male	60.0%	26.7%
Female	40.0	73.3
Gestational Age (wks)	38.9 ± 1.5	36.8 ± 2.5	0.01
Infant Weight (g)	3319 ± 425	2610 ± 911	0.01
Infant Length (in)	19.9 ± 1.2	18.0 ± 1.8	0.004
Cigarettes/day
Before pregnancy		20.6 ± 10.2
In week before study entry		6.9 ± 8.7
During 1^st trimester		14.5 ± 8.6
During 3^rd trimester		10.5 ± 7.8