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. 2023 Aug 16;131(8):087009. doi: 10.1289/EHP10831

Figure 2.

Figure 2 is a forest plot titled heat waves and cold spells stratified by preterm birth subtype, plotting (bottom to top) ninety-fifth to 2 days; ninety-fifth to days; ninetieth to 2 days; ninetieth to 3 days; ninetieth to days; tenth to 2 days; tenth to 3 days, tenth to days; fifth to 2 days; and fifth to days (y-axis) across odds ratio and 95 percent confidence interval, ranging from 0.8 to 1.5 in increments of 0.1 (x-axis) for early preterm birth, to 1 week, early preterm birth to 2 weeks, late preterm birth to 1 week, and late preterm birth to 2 weeks.

Associations of extreme climate events with the early and late preterm births in 1 and 2 wk before delivery in China Labor and Delivery Survey. (See Table S5 for corresponding numeric data). Note: Generalized linear mixed model was used to examine the associations. ORs represent a 1-unit increase in extreme weather events and are presented with a 95% CI. All models were adjusted for maternal age, maternal ethnicity, maternal education, insurance type, child sex, parity, GDP per capita, geographic region, conception season, conception year, PM2.5, and O3. CI, confidence interval; GDP, gross domestic product; OR, odds ratio; PM2.5, particulate matter with aerodynamic diameter ≤2.5μm.