Table 4.

Number (and Percentage) and Univariate Odds Ratios of Variables Related to the Infant

Cases (%)Controls (%)OR (95% CI)
Infants' sex*
 Male138 (59.5)476 (51.7)1.37 (1.01, 1.86)
 Female94 (40.5)445 (48.3)1.00
 Ethnicity
 Maori69 (55.6)196 (21.7)4.76 (3.12, 7.27)
 Pacific Islander8 (6.5)71 (7.9)1.52 (0.62, 3.51)
 Other47 (37.9)635 (70.4)1.00
Birth weight
 <2500 g15 (12.1)47 (5.2)4.07 (1.95, 8.44)
 2500–2999 g30 (24.2)139 (15.3)2.75 (1.57, 4.83)
 3000–3499 g46 (37.1)302 (33.2)1.94 (1.18, 3.20)
 3500+ g33 (26.6)421 (46.3)1.00
Gestation
 <38 weeks24 (19.7)84 (8.0)2.35 (1.38, 3.98)
 38+ weeks98 (80.3)806 (92.0)1.00
  • * Additional data on infants' sex for cases was obtained from death registration forms.