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. Author manuscript; available in PMC: 2023 Mar 1.
Published in final edited form as: Environ Res. 2021 Nov 3;204(Pt C):112315. doi: 10.1016/j.envres.2021.112315

Table 2.

Associations between heat exposure (1°C increment) during last week before delivery and preterm birth in NC, 2003–2014 warm season

Air pollution adjustment HR (95% CI)
Without adjustment for air pollution 1.010 (1.003, 1.017)
Adjusted for PM2.5 1.010 (1.002, 1.018)
Adjusted for O3 1.010 (1.000, 1.020)

Note: HR for 1°C increase in average temperature during the last week before delivery

Models adjusted for maternal age, race/ethnicity, median annual household income, parity, infant sex, year of birth, maternal marital status, average dew point temp, average PM2.5 or O3 during last week of pregnancy, region, and percentage of population with less than high school education