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Table 6 Crude post-neonatal mortality rates and rate ratios, and post-neonatal mortality rates and rate ratios after excluding live births <22 weeks and <28 weeks, among selected high-income countries, 1995–2005 and 2005

From: Differences in perinatal and infant mortality in high-income countries: artifacts of birth registration or evidence of true differences?

Gestational age/Birth weight 1995-2005 2005
Rate (95 % CI) Rate Ratio (95 % CI) Rate (95 % CI) Rate Ratio (95 % CI)
GA (weeks) ≥22 Canada 1.6 (1.5–1.6) 1.62 (1.57–1.68) 1.4 (1.2–1.5) 1.54 (1.36–1.73)
USA 2.4 (2.3–2.4) 2.41 (2.40–2.43) 2.3 (2.3–2.3) 2.59 (2.54–2.65)
Denmark 1.2 (1.1–1.3) 1.17 (1.09–1.25) 1.0 (0.8–1.3) 1.12 (0.86–1.43)
Finland 1.0 (1.0–1.1) 1.00 0.9 (0.7–1.2) 1.00
Norway 1.1 (1.1–1.2) 1.18 (1.09–1.26) 0.7 (0.5–1.0) 0.79 (0.56–1.08)
Sweden 1.1 (1.0–1.2) 1.14 (1.07–1.21) 1.1 (0.9–1.3) 1.19 (0.98–1.44)
≥28 Canada 1.5 (1.4–1.5) 1.49 (1.44–1.54) 1.2 (1.1–1.4) 1.43 (1.26–1.61)
USA 2.1 (2.1–2.1) 2.13 (2.11–2.14) 2.0 (1.9–2.0) 2.32 (2.27–2.37)
Denmark 1.2 (1.1–1.2) 1.15 (1.07–1.23) 0.9 (0.7–1.2) 1.04 (0.79–1.35)
Finland 1.0 (0.9–1.1) 1.00 0.9 (0.6–1.1) 1.00
Norway 1.0 (1.0–1.1) 1.06 (0.98–1.15) 0.6 (0.4–0.8) 0.70 (0.48–0.98)
Sweden 1.0 (0.9–1.1) 1.03 (0.96–1.09) 0.9 (0.7–1.1) 1.07 (0.86–1.31)
BW (grams) ≥500 Canada 1.6 (1.5–1.6) 1.57 (1.52–1.62) 1.4 (1.2–1.5) 1.53 (1.36–1.72)
USA 2.3 (2.3–2.3) 2.32 (2.30–2.33) 2.3 (2.2–2.3) 2.56 (2.51–2.61)
Denmark 1.2 (1.1–1.3) 1.18 (1.10–1.26) 1.0 (0.8–1.3) 1.12 (0.86–1.42)
Finland 1.0 (0.9–1.1) 1.00 0.9 (0.7–1.2) 1.00
Norway 1.1 (1.1–1.2) 1.13 (1.05–1.22) 0.7 (0.5–0.9) 0.77 (0.55–1.05)
Sweden 1.1 (1.0–1.2) 1.10 (1.04–1.16) 1.0 (0.9–1.3) 1.18 (0.97–1.43)
≥1000 Canada 1.5 (1.4–1.5) 1.51 (1.46–1.57) 1.2 (1.0–1.3) 1.52 (1.33–1.72)
USA 2.0 (2.0–2.1) 2.13 (2.12–2.14) 1.9 (1.9–2.0) 2.48 (2.43–2.54)
Denmark 1.1 (1.1–1.2) 1.20 (1.12–1.28) 0.9 (0.7–1.2) 1.00 (0.76–1.30)
Finland 1.0 (0.9–1.0) 1.00 0.8 (0.6–1.0) 1.00
Norway 1.0 (1.0–1.1) 1.09 (1.01–1.18) 0.6 (0.4–0.8) 0.76 (0.53–1.06)
Sweden 1.0 (0.9–1.1) 1.04 (0.98–1.11) 0.9 (0.7–1.1) 1.16 (0.93–1.42)
All live births Canada 1.6 (1.5–1.6) 1.57 (1.52–1.62) 1.4 (1.2–1.5) 1.54 (1.36–1.73)
USA 2.4 (2.3–2.4) 2.34 (2.32–2.35) 2.3 (2.3–2.3) 2.60 (2.54–2.65)
Denmark 1.2 (1.1–1.3) 1.17 (1.09–1.25) 1.0 (0.8–1.3) 1.12 (0.86–1.43)
Finland 1.0 (0.9–1.1) 1.00 0.9 (0.7–1.2) 1.00
Norway 1.1 (1.1–1.2) 1.14 (1.06–1.22) 0.7 (0.5–1.0) 0.79 (0.56–1.08)
Sweden 1.1 (1.0–1.2) 1.10 (1.04–1.17) 1.1 (0.9–1.3) 1.19 (0.98–1.44)
  1. GA gestational age and BW birth weight. Rates are expressed per 1,000 infants at risk. Only births with gestational age <22 weeks excluded from the rate calculation for births 22 weeks i.e., births with unknown gestational age included in the calculations. Calculations of rates for births 28 weeks and birth weight 500 g and 1000 g were carried out in a similar manner. Finland was used as the reference category for calculation of rate ratios