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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: Environ Int. 2019 Feb 15;126:7–13. doi: 10.1016/j.envint.2019.02.023

Fig. 3. Relative risks of preterm birth associated with temperature extremes over the subsequent four days by individual characteristics.

Fig. 3.

Abbreviations: CI, confidence interval.

Models were adjusted for long-term and seasonal trends using a natural cubic spline of time with 8 degrees of freedom per year, relative humidity using a natural cubic spline with 3 degrees of freedom, day of the week, federal holidays, and the temporal variation of the daily expected count of preterm births.