Table 1

Characteristics of the study population

Variable Number of twin infants Mean Standard deviation
Birth weight (g)6011218363
Gestation (weeks)602  282.3
Median IQ Range
Apgar score
 1 minute58664–7
 5 minutes58887–9
CRIB score36821–6
Number per category % of 602
Sex598
 Male31853
 Female28047
Race414
 Aboriginal61
 Asian285
 Caucasian36861
 African, Indian40.7
 Polynesian81
RDS542
 Present36060
 Absent18230
Survival602
 Survived52687
 Died7613
Antenatal steroids578
 Optimal33456
 Suboptimal13422
 None11018
Surfactant592
 Used33254
 Not used26544
  • RDS, Respiratory distress syndrome.