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Table 3 Perinatal mortality (22+0 weeks – 6 days) risk per region after adjustment for risk factors.

From: Regional perinatal mortality differences in the Netherlands; care is the question

  Unadjusted Adjusted Model I# Adjusted Model II
  OR 95% CI OR 95% CI OR 95% CI
Region       
   North 1.11 1.03–1.19 1.20 1.12–1.28 1.11 1.03–1.20
   East 1.01 0.96–1.07 1.08 1.02–1.14 1.04 0.98–1.10
   West* 1.00 reference 1.00 reference 1.00 reference
   South 0.95 0.90–1.00 1.01 0.95–1.06 0.97 0.91–1.03
Maternal age       
   < 20 years 1.68 1.49–1.91 1.38 1.22–1.57 1.36 1.20–1.54
   20–34 years 1.00 reference 1.00 reference 1.00 reference
   ≥ 35 years 1.23 1.17–1.30 1.28 1.21–1.35 1.29 1.23–1.36
Parity       
   Parity 0 1.40 1.33–1.47 1.42 1.35–1.49 1.42 1.35–1.49
   Parity 1 1.00 reference 1.00 reference 1.00 reference
   Parity 2+ 1.44 1.36–1.53 1.32 1.24–1.41 1.31 1.23–1.40
Ethnicity       
   Western 1.00 reference 1.00 reference 1.00 reference
   Non-Western 1.42 1.35–1.50 1.43 1.36–1.50 1.37 1.29–1.45
Urbanization       
   Very urban 1.10 1.05–1.16    0.92 0.86–0.98
   Middle 1.00 reference    1.00 reference
   Very rural 1.01 0.96–1.07    1.03 0.98–1.10
SES       
   Low 1.23 1.18–1.30    1.15 1.09–1.21
   Middle 1.00 reference    1.00 reference
   High 0.90 0.85–0.95    0.91 0.86–0.96
  1. * Region west was set as reference area as the perinatal mortality rate of this region was equal to the overall rate.
  2. # Model I was adjusted for maternal age, parity and ethnicity.
  3. Model II was an extension of model I with additional adjustment for degree of urbanization and SES.