TABLE 5

Logistic Regression Analysis to Determine Risk Factors for Delayed Immunizations

Risk FactorAdjusted Odds Ratio (95% Confidence Interval)
2 mo4 mo6 mo9 mo12 mo
ELBW, <1000 g7.6 (6.3–9.1)4.3 (3.6–5.1)2.4 (2.1–2.9)2.1 (1.7–2.6)1.8 (1.4–2.3)
VLBW, 1000–1499 g1.8 (1.4–2.2)1.3 (1.1–1.5)1.2 (1.0–1.5)1.1 (0.8–1.4)
Black1.5 (1.4–1.7)1.6 (1.5–1.7)1.6 (1.6–1.7)1.6 (1.5–1.7)1.5 (1.4–1.6)
Hispanic1.3 (1.3–1.4)1.3 (1.3–1.4)1.3 (1.3–1.3)1.1 (1.1–1.2)1.1 (1.0–1.2)
Birth year
    19973.3 (3.1–3.5)2.1 (2.0–2.2)1.6 (1.5–1.6)2.9 (2.8–3.1)4.0 (3.7–4.3)
    19981.2 (1.1–1.3)1.2 (1.2–1.3)1.1 (1.0–1.1)1.3 (1.2–1.3)1.4 (1.3–1.5)
    19992.0 (1.9–2.2)1.5 (1.4–1.5)1.2 (1.1–1.3)1.8 (1.7–1.9)2.2 (2.0–2.4)
    20001.5 (1.4–1.6)1.2 (1.2–1.3)1.2 (1.1–1.2)1.4 (1.3–1.5)1.6 (1.4–1.7)
  • VLBW at 4 months not reported because of significant weight-by-race or ethnicity interaction effect.