"adverse perinatal outcomes; birth spacing; causal inference; epidemiologic bias; interpregnancy interval; preterm birth"

Good practices for the design, analysis, and interpretation of observational studies on birth spacing and perinatal health outcomes

BACKGROUND: Meta-analyses of observational studies have shown that women with a shorter interpregnancy interval (the time from delivery to start of a subsequent pregnancy) are more likely to experience adverse pregnancy outcomes, such as preterm …