Extended Data Fig. 10: Stratified analyses of effect modifiers in the associations between high temperature the week before birth (99^th vs 75^th percentile) and perinatal mortality.

The figure depicts the stratified pooled estimates by some key effect modifiers that could potentially modify the associations between short-term exposure of ambient air pollution and still births. The key modifiers included maternal age, HIV status, hypertensive disorders, number of pregnancies, sex of the child, preterm births, low birthweight, labour complication and antepartum haemorrhage (APH). The estimates are presented as odds ratio (OR) and 95% confidence intervals obtained from conditional logistic regression models. The estimates show the association of an increase in temperature (from the 75^th to the 99^th percentile) the week before birth (lag 0–6) on stillbirths, antepartum stillbirths, intrapartum stillbirths, and perinatal deaths.