Table 2 The pooled odds ratios (ORs) of fetal death for 5 µg/m³ increment in PM_2.5 with 95% confidence intervals (CI), by specific subgroups of gestational age (GA). The GA-specific ORs are estimated by meta-analysis to pool results from double robust models together, for all possible GA-specific exposure-outcome pairs

First trimester

(1^st − 3^rd month)

1.098

(1.061, 1.137)

1.037

(1.004, 1.071)

1.048

(1.008, 1.089)

1.060

(1.039, 1.082)

Second trimester

(4^th − 7^th month)

–

1.059

(1.024, 1.095)

1.015

(0.974, 1.056)

1.041

(1.014, 1.068)

Third trimester

(> 7^th month)

–

–

1.043

(1.005, 1.082)

1.043

(1.005, 1.082)

Entire gestation

1.110

(1.059, 1.164)

1.052

(1.004, 1.101)

1.083

(1.025, 1.145)

1.081

(1.051, 1.112)