Shapiro GD, et al. - Researchers used data from a nationally representative Canadian sample to examine the associations of maternal marital and cohabitation status with stillbirth, infant mortality, preterm birth (PTB), and small- and large-for-gestational-age (SGA and LGA) birth. Analyses adjusted for maternal age and education were carried out and log-binomial regression was used to estimate risk ratios for adverse birth outcomes associated with being single or living with a common-law partner. In the 2006 Canadian Birth-Census Cohort, created by linking birth registration data with the 2006 long-form census, similar birth outcomes were reported for cohabiting and legally-married women, but most outcomes for single women were substantially worse.