. Author manuscript; available in PMC: 2017 Jul 1.

Published in final edited form as: Am J Perinatol. 2016 Feb 23;33(8):776–780. doi: 10.1055/s-0036-1572434

Table 1.

Baseline characteristics of women with varying degrees of insulin resistance compared with those with normal 1-h GCT (using National Diabetes Data Group criteria)

Total Cohort N = 5,983 (Includes 165 women diagnosed with GDM)	Reference Normal 1-h GCT N = 5,230 (87.4%)	Elevated 1-h GCT, all normal values on 3-h GTT N = 454 (8.9%)	Elevated 1-h GCT, one abnormal value on 3-h GTT N = 134 (2.2%)	p Value
Maternal age Median (IQR)	24 (20, 29)	27 (23, 32)	28 (24, 33)	0.018
AMA	380 (7.3%)	59 (13.0%)	26 (19.4%)	< 0.001
Primiparity	1,608 (30.8%)	121 (26.7%)	36 (26.9%)	0.116
BMI, mean ± SD	32.3 ± 7.6	33.4 ± 8.0	35.3 ± 7.6	0.283
Obese (BMI ≥ 30.0 kg/m²)	2,872 (56.4%)	275 (62.2%)	100 (75.8%)	< 0.001
African American	3,575 (68.4%)	232 (51.1%)	67 (50.0%)	< 0.001
Chronic hypertension	207 (4.0%)	20 (4.4%)	5 (3.7%)	0.886
History of GDM	33 (0.6%)	26 (5.7%)	48 (35.8%)	< 0.001
Smoking	914 (17.5%)	76 (16.7%)	21 (15.7%)	0.804

Abbreviation: AMA, advanced maternal age; BMI, body mass index; GCT, glucose challenge test; GDM, gestational diabetes mellitus; GTT, glucose tolerance test; IQR, interquartile range; SD, standard deviation. Note: Significant p values < 0.05 are given in bold.