Extended Data Fig. 3. Associations between mean temperature and perinatal mortality by number of knots and their location.

Sensitivity analysis: The figure depicts the pooled estimates evaluating heat effect by applying a varying number of knots and adjusting their locations (1 knot at the 50^th and 75^th, 2 knots at the 25^th and 50^th, 2 knots at the 50^th and 75^th, 2 knots at the 50^th and 90^th, 2 knots at the 75^th and 90^th, 3 knots at the 10^th, 50^th, and 90^th, and 3 knots at the 25^th, 50^th, and 75^th). Our main model included 3 knots at the 10^th, 75^th and 90^th percentile. 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.