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

Table 2 Residual missing data after correction according to maternal origin in Brussels birth certificates in 2009

Variable	% missing data
Variable	Belgian	EU15	Maghreb	Sub-Saharan Africa	Eastern Europe	Turkey	South-East Asia
Pregnancy and infant characteristics
Transfer to NICU	1.03	0.81	0.79	1.07	0.93	0.82	1.19
Date of the last delivery	8.12	10.87	10.71	13.02	12.35	14.38	10.32
Mother characteristics
Educational level	3.81	4.88	8.09	9.83	9.44	6.65	7.85
Employment status	0.52	0.90	0.98	1.32	1.19	0.72	0.51
Type of work	0.75	1.26	1.56	1.84	1.50	1.02	1.54
Father characteristics
Birth date	0.67	0.44	0.45	1.64	0.88	0.32	1.24
Educational level	4.36	4.36	6.64	7.91	6.69	5.99	7.10
Employment status	1.15	1.07	1.21	2.49	1.56	0.95	1.42
Type of work	1.22	1.14	1.03	3.04	1.71	0.84	1.78
Original nationality	0.77	0.44	0.47	1.64	1.03	0.32	1.07
Present nationality	0.73	0.44	0.49	1.59	0.93	0.32	1.24

Analyses were performed if missing rate exceeded 0.5%. Comparison group was Belgian women. In bold: differences statistically significant with a p-value <0.001. Not in bold: not statistically significant at a significance level of 0.05.
NICU, neonatal Intensive Care Unit; EU15, Former 15-European Union member countries.

ISSN: 2049-3258