Table 2.

Adjusted odds ratios (aOR) and 95% confidence intervals (CI) for factors associated with small for gestational age, St. Louis City and County, 2000–2009 (N = 142,017).

Risk/preventive factors	Strata-gestational age (weeks)
	Extremely preterm: 24–28 weeks		Very preterm: 29–32 weeks		Late preterm: 33–36 weeks		Full term: 37 + weeks
	(n = 1,403)		(n = 2,910)		(n = 17,592)		(n = 120,112)
	aOR	95% CI	aOR	95% CI	aOR	95% CI	aOR	95% CI
Maternal race: black	0.78	0.50, 1.22	1.07	0.82, 1.41	1.23	1.10, 1.37	2.18	2.09, 2.29
Maternal race: white	1.00		1.00		1.00		1.00
Maternal age: ≤19	0.41	0.20, 0.85	0.69	0.47, 1.01	0.93	0.79, 1.10	0.98	0.92, 1.05
Maternal age: 20–34	1.00		1.00		1.00		1.00
Maternal age: ≥35	0.92	0.50, 1.69	1.42	1.05, 1.93	0.99	0.87, 1.14	1.10	1.03, 1.17
Maternal education: <12	0.95	0.54, 1.67	0.97	0.70, 1.36	0.72	0.63, 0.83	1.14	1.07, 1.20
Maternal education: ≥12	1.00		1.00		1.00		1.00
Medicaid: yes	1.20	0.77, 1.88	1.05	0.80, 1.39	0.89	0.79, 0.99	1.17	1.11, 1.22
Medicaid: no	1.00		1.00		1.00		1.00
Inadequate PNC: yes	0.91	0.57, 1.47	0.88	0.64, 1.21	0.84	0.72, 0.98	1.25	1.18, 1.32
Adequate PNC	1.00		1.00		1.00		1.00
Inadequate weight gain: no	1.76	1.10, 2.80	1.74	1.29, 2.36	1.60	1.41, 1.81	2.11	2.01, 2.21
Adequate weight gain	1.00		1.00		1.00		1.00
Parity: nulliparous	0.97	0.60, 1.56	1.39	1.06, 1.83	1.28	1.14, 1.44	1.42	1.35, 1.49
Parity: primiparous	1.00		1.00		1.00		1.00
Parity: multiparous	0.61	0.36, 1.04	0.60	0.44, 0.82	1.06	0.94, 1.19	0.94	0.89, 0.99
Smoking: yes	0.95	0.53, 1.70	1.08	0.77, 1.51	1.60	1.40, 1.82	2.08	1.97, 2.20
Smoking: no	1.00		1.00		1.00		1.00
Diabetes: yes	1.17	0.43, 3.18	0.78	0.47, 1.31	0.72	0.59, 0.89	0.66	0.59, 0.74
Diabetes: no	1.00		1.00		1.00		1.00
Chronic hypertension: yes	0.64	0.18, 2.21	1.69	1.03, 2.76	1.12	0.88, 1.44	1.46	1.27, 1.68
Chronic hypertension: no	1.00		1.00		1.00		1.00
Preeclampsia: yes	3.41	2.11, 5.52	2.10	1.62, 2.72	2.82	2.52, 3.16	2.19	2.04, 2.36
Preeclampsia: no	1.00		1.00			1.00		1.00