TABLE 6.

Neonatal Mortality Rates by Birth Weight Groups for United States, Australia, Canada, and the United Kingdom (United States as Reference)

United States39Australia24*Canada40England and Wales26
Crude mortality
 Rate per 1000 births4.73.03.73.8
 RR1.000.66*0.80*0.83*
 (95% CI)(0.62, 0.71)(0.74, 0.85)(0.79, 0.86)
Birth weight <1000 g
 Rate per 1000 births396.7330.4444.9391.4
 RR1.000.841.120.99
 (95% CI)(0.75, 0.94)(1.00, 1.25)(0.93, 1.05)
Birth weight 1000–2499 g
 Rate per 1000 births13.212.816.912.4
 RR1.000.971.260.95
 (95% CI)(0.84, 1.12)(1.10, 1.45)(0.88, 1.02)
Birth weight >2500 g
 Rate per 1000 births0.950.901.001.12
 RR1.000.951.061.15
 (95% CI)(0.84, 1.09)(0.93, 1.21)(1.07, 1.24)
  • * Data from 1997, not including live births <400 g.

  • P value <.05.

  • P value <.001.