Skip to main content

Advertisement

Table 3 Odds ratios (ORs) and 95% confidence intervals (CIs) for small-for-gestational age (SGA) and low birth weight (LBW) at term per interquartile-increase in PM2.5, stratified by employment status, in 386,483 singleton term births in Seoul, Korea for 2008–2012

From: Association between ambient particulate matter concentration and fetal growth restriction stratified by maternal employment

  District-mean Seoul-mean
Employed Non-employed RERI (95% CI) Employed Non-employed RERI (95% CI)
SGA
 One year before birth 0.98 (0.96, 1.01) 1.01 (0.99, 1.02) −0.02 (−0.06, 0.01) 0.97 (0.90, 1.05) 0.99 (0.94, 1.04) −0.03 (− 0.06, 0.00)
 Entire pregnancy 0.98 (0.96, 1.00) 1.00 (0.98, 1.01) −0.03 (− 0.07, 0.00) 1.00 (0.94, 1.05) 0.96 (0.93, 1.00) −0.03 (− 0.06, 0.00)
 First trimester 1.00 (0.98, 1.01) 1.00 (0.99, 1.01) 0.00 (−0.04, 0.03) 1.01 (0.99, 1.04) 0.99 (0.98, 1.00) 0.00 (−0.03, 0.03)
 Second trimester 0.99 (0.97, 1.01) 1.00 (0.99, 1.01) −0.02 (− 0.05, 0.02) 1.00 (0.97, 1.03) 0.98 (0.97, 1.00) −0.03 (− 0.06, 0.00)
 Third trimester 0.99 (0.97, 1.01) 1.00 (0.99, 1.01) 0.00 (−0.04, 0.03) 0.99 (0.97, 1.01) 1.00 (0.99, 1.02) −0.01 (− 0.04, 0.03)
LBW
 One year before birth 0.98 (0.96, 1.01) 1.05 (0.95, 1.17) −0.05 (− 0.15, 0.05) 0.97 (0.9, 1.05) 0.89 (0.39, 2.04) −0.07 (− 0.15, 0.02)
 Entire pregnancy 0.98 (0.96, 1.00) 1.07 (0.97, 1.18) −0.09 (− 0.19, 0.01) 1.00 (0.94, 1.05) 1.38 (0.89, 2.13) −0.07 (− 0.16, 0.01)
 First trimester 1.00 (0.98, 1.01) 1.03 (0.96, 1.11) −0.05 (− 0.15, 0.04) 1.01 (0.99, 1.04) 1.01 (0.88, 1.17) −0.01 (− 0.09, 0.07)
 Second trimester 0.99 (0.97, 1.01) 1.01 (0.94, 1.09) −0.03 (− 0.12, 0.07) 1.00 (0.97, 1.03) 1.00 (0.87, 1.15) −0.05 (− 0.13, 0.03)
 Third trimester 0.99 (0.97, 1.01) 1.06 (0.98, 1.14) −0.03 (− 0.13, 0.06) 0.99 (0.97, 1.01) 1.11 (0.95, 1.3) −0.03 (− 0.13, 0.06)
  1. RERI Relative excess risk due to interaction. ORs are adjusted for birth date (birth year and month), infant sex, maternal education, maternal age, parity (first childbirth or not), birth season, and gestational age. All ORs and 95% Cis across five antenatal periods were estimated for an interquartile range of PM2.5 during full year of pregnancy (7.8 μg/m3) to all estimates