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Fig. 4 | Environmental Health

Fig. 4

From: Maternal exposure to ambient fine particulate matter and risk of premature rupture of membranes in Wuhan, Central China: a cohort study

Fig. 4

Smooth curves between the mean concentration of PM2.5 for each trimester and the whole pregnancy and PPROM*. *The orange line represents the association between the mean concentration of PM2.5 during the whole pregnancy and PPROM, adjusted for year of birth, season of conception, maternal age, parity, maternal anemia, preeclampsia, gestational diabetes, and history of obstetrical-gynecological pathology (Model I); The purple line represents the association between the mean concentration of PM2.5 during the first trimester and PPROM, adjusted for Model I plus mean concentration of PM2.5 in second and third trimesters; The green line represents the association between the mean concentration of PM2.5 during the second trimester and PPROM, adjusted for Model I plus mean concentration of PM2.5 in the first and third trimesters; The blue line represents the association between the mean concentration of PM2.5 during the third trimester and PPROM, adjusted for Model I plus mean concentration of PM2.5 in the first and second trimester

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