TABLE 1.

Neonatal Characteristics of Children With and Without Blood Pressure Follow-up Data at 6 Years of Age Available for Analysis

Neonatal VariablesBP Records (n = 223)*No BP Records or Follow-Up Data (n = 95)*Difference (95% CI)P
Birth weight, g2190 (1860 to 2650)2060 (1760 to 2710)80 (−70 to 250).24
Birth weight z score−0.35 (−0.82 to 0.18)−0.34 (−0.76 to 0.18)−0.02 (−0.19 to 0.16).74
Gestational age, d244 (231 to 259)239 (224 to 259)4 (−2 to 9).12
Entry/delivery interval, d2.6 (1 to 29)3.6 (1–31)−0.3 (−1.5 to 0.5).67
Term delivery59 (26.5%)24 (25.3%)0.95 (0.63 to 1.44).82
Male128 (57.4%)55 (57.9%)1.01 (0.82 to 1.24).93
Betamethasone121 (54.3%)56 (58.9%)1.09 (0.88 to 1.34).44
RDS21 (9.4%)11 (11.6%)1.23 (0.62 to 2.45).56
RDS (moderate or severe)18 (8.1%)7 (7.4%)0.91 (0.39 to 2.11).83
5-min Apgar score of >7172 (77.1%)72 (75.8%)0.98 (0.86 to 1.12).80
Multiple pregnancy28 (12.6%)20 (21.1%)1.68 (1.00 to 2.82).05
Instrumental delivery114 (51.1%)50 (52.6%)1.03 (0.82 to 1.30).81
  • BP indicates blood pressure.

  • * Data are either median (interquartile range) or count (percentage).

  • Data are either difference between medians (95% CI) or relative risk (95% CI).

  • Based on all live births in New Zealand, 1991/1992.15