Table 3.

Influence of Model Covariates on Results, Right From the Start: A Study of Early Pregnancy Health, Southern United States, 2000–2012

Model Focus	Covariates in Model	HR	95% CI
No adjustments	Fibroid status only	1.29	1.02, 1.64
Age	Age	1.00	0.79, 1.28
Basic demographics	Age, race/ethnicity	0.94	0.73, 1.21
Basic behavioral	Age, race/ethnicity, smoking, alcohol use	0.85	0.66, 1.11
Expanded behavioral	Age, race/ethnicity, smoking, alcohol use, caffeine use, prenatal vitamin use, progesterone supplementation	0.86	0.66, 1.12
Expanded behavioral with metabolic	Age, race/ethnicity, smoking, alcohol use, caffeine use, prenatal vitamin use, progesterone supplementation, diabetes status, body mass index	0.87	0.66, 1.13
Control of confoundinga	Age, race/ethnicity, alcohol use, prior termination of pregnancy, parity	0.83	0.63, 1.08

Abbreviations: CI, confidence interval; HR, hazard ratio.

^a Final model presented in text.