Fig 5. Hazard ratios for five-year mortality.

Model 1: the results were adjusted for caesarean section (yes or no), maternal age (<25, 25–30, 30–35, > = 35), parity (1, 2, and 3), and birth year (1997–1999, 2000–2002, 2003–2005, and 2006–2008). Model 2, the results were additionally adjusted for maternal education (low, middle, and high) and maternal cohabitant status during birth (yes, no). Restricted analyses: the analyses were restricted to pregnancies without registered morbidity within one year before delivery or within 30 days after delivery using the same adjustments in Model 2.