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Table 2 Distribution of live births by gestational age (GA) and birth weight (BW) among selected high-income countries, 1995–2005

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

Gestational age/Birth weight Canada USA Denmark Finland Iceland Norway Sweden
Number (%) Number (%) Number (%) Number (%) Number (%) Number (%) Number (%)
GA (weeks) <22 1,494 33,691 64 6 0 101 not reported
(0.07) (0.08) (0.01) (0.001) (0.00) (0.02)
22–23 1,902 58,438 174 175 21 272 335
(0.08) (0.13) (0.02) (0.03) (0.05) (0.04) (0.03)
24–25 2,774 90,104 637 308 47 666 1,056
(0.12) (0.21) (0.09) (0.05) (0.10) (0.11) (0.10)
26–27 3,982 115,727 1,122 477 61 1,050 1,633
(0.17) (0.27) (0.16) (0.08) (0.13) (0.17) (0.16)
28–31 14,820 428,298 4,927 3,510 265 4,486 6,628
(0.65) (0.98) (0.68) (0.56) (0.57) (0.73) (0.64)
32–36 146,954 3,825,597 39,283 28,953 2,099 35,881 55,058
(6.40) (8.78) (5.44) (4.59) (4.55) (5.82) (5.35)
37–41 2,093,277 37,425,755 618,667 568,932 40,625 516,860 882,169
(91.1) (85.9) (85.7) (90.2) (88.1) (83.8) (85.8)
≥42 32,197 1,595,445 57,135 28,180 2,992 57,565 81,697
(1.40) (3.66) (7.91) (4.47) (6.49) (9.33) (7.94)
Unknown 5,699 432,844 6,642 5,369 199 25,258 1,273
(0.25) (0.98) (0.91) (0.84) (0.43) (3.93) (0.12)
BW (grams) <500 2,315 60,211 158 166 6 255 185
(0.10) (0.14) (0.02) (0.03) (0.01) (0.04) (0.02)
500–749 3,790 120,794 742 751 60 898 1,059
(0.16) (0.27) (0.10) (0.12) (0.13) (0.14) (0.10)
750–999 4,228 128,551 1,250 920 80 1,224 1,672
(0.18) (0.29) (0.17) (0.14) (0.17) (0.19) (0.16)
1,000–1,499 11,584 319,100 4,015 2,745 215 3,561 4,689
(0.50) (0.73) (0.56) (0.43) (0.46) (0.56) (0.46)
1,500–1,999 25,331 666,492 8,240 5,590 380 6,852 9,249
(1.10) (1.52) (1.14) (0.88) (0.82) (1.07) (0.90)
≥2000 2,250,300 42,694,623 707,730 624,694 45,563 628,658 1,008,332
(97.9) (97.1) (98.0) (98.4) (98.4) (98.0) (98.4)
Unknown 5,551 16,128 6,516 1,044 5 691 4,663
(0.24) (0.04) (0.89) (0.16) (0.01) (0.11) (0.45)
Total 2,303,099 (100.0) 44,005,899 (100.0) 728,651 (100.0) 635,910 (100.0) 46,309 (100.0) 642,139 (100.0) 1,029,849 (100.0)
  1. Percentages calculated after excluding live births with unknown gestational age or birth weight (except for total and unknown cells)