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Table 1 Residual missing data after correction in Brussels birth certificates in 2008 and 2009

From: Missing information in birth certificates in Brussels after reinforcement of data collection, and variation according to immigration status. A population-based study

Variable % missing data in 2008 (N = 23375) % missing data in 2009 (N = 24157)
Pregnancy and infant characteristics
Date of birth 0.00 0.00
Sex 0.02 0.00
Plurality and birth order 0.00 0.00
Presentation 0.44 0.19
Induction 0.22 0.09
Mode of delivery 0.00 0.12
Gestational age 0.28 0.28
Birthweight 0.18 0.24
Respiratory assistance 15.50 0.37
1 minute Apgar score 0.26 0.35
5 minute Apgar score 0.27 0.36
Transfer to NICU 15.50 0.94
Parity 0.74 0.12
Date of the last delivery 10.15 10.54
Hypertension 0.00 0.00
Diabetes 0.00 0.00
Birth defect 0.03 0.26
Place of delivery 0.00 0.00
Type of maternity 0.00 0.00
Mother characteristics
Birth date 0.05 0.00
Educational level 9.48 6.46
Employment status 1.06 0.90
Type of work 1.45 1.27
Original nationality 2.56 0.02
Present nationality 0.07 0.01
Cohabitation status 0.55 0.26
Marital status 0.15 0.11
Date of marriage 0.40 0.12
Residence 0.09 0.00
Father characteristics
Birth date 1.18 0.71
Educational level 7.57 5.63
Employment status 1.96 1.37
Type of work 1.88 1.43
Original nationality 10.70 0.77
Present nationality 1.44 0.74
  1. NICU, Neonatal Intensive Care Unit.