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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 4.

Associations between heat exposure (1°C increment) during last week of gestation and preterm birth stratified by greenness and SES

HR (95% CI) SES (median annual household income)
Low (<44768.5) Medium (44768.557909.5) High (≥57909.5)
Greenness
 Low (<0.6) 1.025 (1.007, 1.043) 1.005 (0.981, 1.029) 1.000 (0.986, 1.014)
 High (≥0.6) 1.015 (1.000, 1.030) 1.018 (1.002, 1.034) 0.979 (0.951, 1.009)

Note: Threshold for designating greenness as high or low based on the median of county-level average NDVI for all urbanicity categories.

Number of births by greenness category and SES: low SES and low greenness 87123, low SES and high greenness 91577; medium SES and low greenness 53883, medium SES and high greenness 126381; high SES and low greenness 153298, high SES and high greenness 34179.