Fig. 1From: The association between parity and spontaneous preterm birth: a population based studyIncidence rates of overall preterm birth and stratified for spontaneous and iatrogenic preterm birth for women in their first (P0), second (P1), third (P2), fourth (P3) and fifth (P4) pregnancy from 2010 through 2014 in The Netherlands. Abbreviations: PTB, preterm birthBack to article page