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Table 4 Perinatal outcome by the three data sources, Finland 1996–1998, %1)

From: Monitoring of IVF birth outcomes in Finland: a data quality study

  MBR IVF statistics IVF research data
Births 3535 3557 3594
- singletons 2735 2765 2819
- multiples 800 792 775
Premature births (< 37 weeks), N 582 623 634
% 16.5 17.5 17.6
- among singletons 8.7 8.5 9.4
- among multiples 43.1 49.0 47.7
Newborns 4331 4383 4384
- singletons 2735 2765 2819
- multiples 1596 1618 1565
Low birth weight (< 2500 grams), N 836 906 856
% 19.3 20.7 19.5
- among singletons 6.0 5.9 6.4
- among multiples 42.2 46.2 43.1
Small-for-gestational age, N n.a. 301 305
% n.a. 6.9 7.0
- among singletons n.a. 2.4 3.1
- among multiples n.a. 15.4 14.4
Birth weight, g    
Mean (SD) n.a. 3085 (787) 3090 (781)
- among singletons n.a. 3440 (625) 3421 (644)
- among multiples n.a. 2475 (650) 2494 (640)
Perinatal mortality, N 61 54 56
per 1000 newborns 14.1 12.3 12.8
- among singletons 8.8 8.3 8.5
- among multiples 23.8 20.4 21.1
Major congenital anomaly cases, N 68 185 179
per 10 000 newborns 157 422 409
  1. 1) The following comparisons are statistically significant: - IVF statistics vs. MBR: Premature births among multiples P = 0.019. Low birth-weight among multiples P = 0.002. Major congenital anomaly cases P < 0.001. - IVF statistics vs. IVF research data: Major congenital anomaly cases P < 0.001. - MBR vs. IVF research data: Low birth-weight among multiples P = 0.013. n.a. = not available