Table 4.

Crude and adjusted association between health condition category and infant and maternal outcomes, Massachusetts Births, 2007–2009

	Crude RR (95% CI)	Adjusted Demographics RR (95% CI)	Adjusted demographics and pregnancy risks RR (95% CI)
Infant outcomes
Preterm Birth
Circulatory	2.5 (2.3–2.6)	2.4 (2.2–2.6)	1.3 (1.3–1.4)
Musculoskeletal	1.4 (1.2–1.7)	1.4 (1.2–1.7)	1.2 (1.0–1.4)
Nervous system/
Sense organ	1.5 (1.3–1.6)	1.4 (1.3–1.6)	1.2 (1.1–1.4)
Other physical	2.0 (1.8–2.2)	2.0 (1.8–2.1)	1.6 (1.4–1.7)
Mental Illness	1.7 (1.6–1.9)	1.6 (1.4–1.7)	1.3 (1.2–1.4)
Mental + physical	2.4 (2.1–2.8)	2.3 (2.0–2.7)	1.6 (1.4–1.8)
2+ physical	2.9 (2.5–3.3)	2.7 (2.4–3.2)	1.6 (1.4–1.9)
Small for
Gestational Age
Circulatory	1.4 (1.3–1.6)	1.4 (1.3–1.6)	1.1 (1.0–1.2)
Musculoskeletal	1.2 (1.1–1.4)	1.2 (1.1–1.4)	1.1 (1.0–1.3)
Nervous system/
sense organ	1.3 (1.1–1.4)	1.2 (1.1–1.3)	1.1 (1.0–1.2)
Other physical	1.3 (1.2–1.4)	1.3 (1.2–1.4)	1.2 (1.1–1.3)
Mental Illness	1.6 (1.4–1.7)	1.3 (1.2–1.4)	1.1 (1.0–1.2)
Mental + physical	1.7 (1.5–2.0)	1.5 (1.3–1.7)	1.2 (1.0–1.4)
2+ physical	1.6 (1.3–1.9)	1.5 (1.3–1.8)	1.2 (1.0–1.4)
Apgar Score < 7 at 5
minutes
Circulatory	2.3 (1.8–2.8)	2.1 (1.7–2.7)	1.6 (1.2–1.9)
Musculoskeletal	0.9 (0.5–1.5)	0.8 (0.5–1.4)	0.8 (0.5–1.3)
Nervous system/
sense organ	2.3 (1.7–3.0)	2.1 (1.6–2.8)	1.9 (1.5–2.6)
Other physical	2.5 (2.0–3.1)	2.4 (1.9–3.0)	2.1 (1.7–2.6)
Mental Illness	1.9 (1.5–2.4)	1.6 (1.2–2.0)	1.4 (1.1–1.8)
Mental + physical	4.3 (3.1–5.9)	3.6 (2.6–5.0)	3.1 (2.3–4.3)
2+ physical	2.4 (1.5–3.7)	2.2 (1.4–4.4)	1.7 (1.1–2.6)

RR: Risk Ratio; CI: Confidence Interval