Changes in fetal and neonatal mortality during 40 years by offspring sex: a national registry-based study in Norway

Table 5 Absolute change (per 1000) and relative change in neonatal mortality by sex of child for non-immigrants in Norway, 1967–2005

	≤ 1 week				1 week - 1 month
	Absolute change		Relative change		Absolute change		Relative change
	Coefficient	95% CI	Coefficient	95% CI	Coefficient	95% CI	Coefficient	95% CI
Boy	9.305	9.067, 9.542	1.406	1.314, 1.504	1.360	1.255, 1.465	1.393	1.176, 1.649
Girl	6.705	6.460, 6.949	1.000		0.972	0.864, 1.080	1.000
Boy * (Year - 1967)	−0.241	−0.252, −0.230	0.947	0.944, 0.950	−0.022	−0.027, −0.017	0.977	0.971, 0.982
Girl * (Year - 1967)	−0.170	−0.182, −0.159	0.949	0.946, 0.952	−0.016	−0.021, −0.011	0.975	0.969, 0.982
Test for equal average trends for boys and girls:	p < 0.001		p = 0.253		p = 0.115		p = 0.729
N	1,964,695				1,956,376

Linear probability and logistic regression analyses. Pregnancies with gestational length > 22 weeks.

ISSN: 1471-2393