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

Table 3 Adjusted absolute change (per 1000) and adjusted relative change in mortality from pregnancy week 23 to 1 month after birth by sex of child for non-immigrants in Norway, 1967–2005

	Absolute change		Relative change
	Coefficient	95% CI	Coefficient	95% CI
Boy	19.647	19.052, 20.242	1.242	1.188, 1.298
Girl	15.958	15.356, 16.560	1.000
Boy * (Year - 1967)	−0.460	−0.477, −0.442	0.958	0.956, 0.960
Girl * (Year - 1967)	−0.365	−0.383, −0.357	0.960	0.958, 0.962
Test for equal average trends for boys and girls:	p < 0.001		p = 0.132
N	1,974,811

Linear probability and logistic regression analyses. Adjustment made for maternal age (five-year intervals), parity (first child, other children), plurality (single, multiple births) and maternal education (compulsory school only, upper secondary education, university/college education, unknown education).

ISSN: 1471-2393