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Table 3 Actual number (N) and prevalence of perinatal deaths (per 1000 newborns) before and after the establishment of prenatal screening

From: Changes in detection of birth defects and perinatal mortality after introduction of prenatal ultrasound screening in the Kola Peninsula (North-West Russia): combination of two birth registries

Group of newborns 1973-2000 1990-2000 2001-2011 p-value1
N Prevalence2 N Prevalence2 N Prevalence2
Newborns with BD (N = 1099) 87 106.6 (84.3-129.1) 18 52.9 (32.5-85.9) 6 21.2 (4.3-38.1) <0.00013
0.01604
Newborns without BD (N = 29 349) 419 18.2 (16.5-19.9) 105 16.5 (13.3-19.6) 60 9.5 (7.1-11.8) <0.00013
<0.00014
  1. 1 p-value is for chi-squared test
  2. 2 95 % confidence intervals are presented in parentheses
  3. 3 For the 1973–2000 and 2001–2011 groups
  4. 4 For the 1990–2000 and 2001–2011 groups