Table 4.
ORs (95% CI) for preterm birth for an IQR increase (5.5°C) in heat index during whole pregnancy, stratified by combinations of individual- and community-level SES
| Community-level SESa | Individual-level SESb |
|
|---|---|---|
| Low | High | |
| Low | 1.100 (1.032, 1.173) | 1.019 (0.972, 1.069) |
| High | 0.973 (0.904, 1.048) | 1.031 (0.986, 1.077) |
a
Community-level SES was based on local taxes including income tax, automobiles tax, and property tax of each gu level.
b
Individual-level SES was based on mother’s education level.