Perinatal mortality and advanced maternal age.

OBJECTIVE To investigate the impact of advanced maternal age on the rate of perinatal mortality. DESIGN Retrospective cohort study including all 56,517 singleton hospital deliveries between 1999 and 2008. METHODS Data were analyzed according to maternal age at delivery in 3 groups of women, 25-34 years, 35-39 years and ≥ 40 years, using the youngest as the reference group. RESULTS Odds ratios (ORs) for antenatal deaths were 0.98 (CI: 0.67-1.43) and 2.57 (CI: 1.57-4.22) for age groups 35-39 years and ≥ 40 years, respectively. Significant differences in neonatal mortality rates between the age groups were not found. Significant amendable risk factors were attendance of <4 health care visits (OR = 15.55, CI: 9.47-25.51 in age group 35-39 years; OR = 16.38, CI: 9.78-27.43 in the age group ≥ 40 years) and obesity (OR = 1.85, CI: 1.27-2.70 in age group 35-39 years; OR = 1.83, CI: 1.22-2.74 in the age group ≥ 40 years). In the multivariate regression analysis, the adjusted ORs for perinatal mortality were 1.03 (95% CI: 0.77-1.39) and 1.66 (95% CI: 1.03-2.66) for age groups 35-39 and ≥ 40, respectively. CONCLUSIONS Women older than 40 years carry an increased risk for stillbirth. Important amendable risk factors are obesity and poor antenatal care.