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. Author manuscript; available in PMC: 2011 Aug 1.

Published in final edited form as: Am J Perinatol. 2011 Mar 4;28(7):571–578. doi: 10.1055/s-0031-1274511

Table 1.

Characteristics of the women and their newborns by caffeine quartiles.

Characteristic	Caffeine quartiles (ng/ml)				p-value for trend
	1^st (0–93)	2^nd (94–266)	3^rd (267–555)	4^th (>555)
	N=63	N=63	N=63	N=62
Maternal age (years)	24.6 (6.1)	24.5 (4.9)	24.7 (5.2)	23.3 (5.1)	0.2
BMI (kg/m²)	24.6 (5.6)	25.6 (6.5)	25.4 (5.9)	24.6 (6.2)	0.9
Sample age	20.0 (2.0)	19.9 (2.0)	20.7 (1.7)	20.7 (2.1)	0.4
Maternal Race
Nonblack	32 (50.8%)	48 (76.2%)	49 (77.8%)	48 (77.4%)	0.03
Black	31 (49.2%)	15 (23.8%)	14 (22.2%)	14 (22.6%)
Smokers	10 (15.9%)	15 (23.8%)	17 (27.0%)	15 (6.0%)	0.2
Education
< 12 years	3 (4.8%)	7 (11.1%)	4 (6.3%)	12 (19.4%)	0.02
GA at delivery (weeks)	38.8 (2.2)	38.9 (2.2)	38.5 (2.4)	38.8 (1.8)	0.8
SGA
≤10^th centile	4 (6.3%)	8 (12.7%)	4 (6.3%)	5 (8.1%)	0.9

BMI, body mass index; GA, gestational age; SGA, small for gestational age and is adjusted for race, sex and gestational age.

Data are presented as means (SD) or numbers (percentages, where the denominator is the n for that quartile.)