Table 2 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 PM10, stratified by employment status in 824,011 singleton term births in Seoul, Korea for 2002–2012
| Â | District-mean | Seoul-mean | ||||
|---|---|---|---|---|---|---|
Employed | Non-employed | RERI (95% CI) | Employed | Non-employed | RERI (95% CI) | |
SGA | ||||||
 One year before birth | 1.01 (0.98, 1.04) | 1.02 (1.00, 1.04) | -0.02 (− 0.06, 0.01) | 0.96 (0.88, 1.05) | 1.00 (0.95, 1.06) | − 0.03 (− 0.06, 0.00) |
 Entire pregnancy | 1.01 (0.98, 1.04) | 1.02 (1.00, 1.03) | −0.03 (− 0.06, 0.01) | 1.02 (0.97, 1.07) | 0.98 (0.95, 1.01) | − 0.03 (− 0.06, 0.01) |
 First trimester | 1.01 (0.99, 1.04) | 1.00 (0.99, 1.02) | −0.01 (− 0.04, 0.02) | 1.02 (0.99, 1.04) | 1.00 (0.98, 1.01) | 0.01 (− 0.02, 0.04) |
 Second trimester | 1.01 (0.99, 1.03) | 1.00 (0.99, 1.02) | −0.01 (− 0.04, 0.02) | 1.01 (0.98, 1.03) | 0.99 (0.97, 1.00) | −0.03 (− 0.06, 0.00) |
 Third trimester | 1.00 (0.98, 1.03) | 1.01 (1.00, 1.03) | −0.01 (− 0.04, 0.02) | 0.99 (0.97, 1.02) | 1.00 (0.98, 1.01) | −0.03 (− 0.06, 0.00) |
LBW | ||||||
 One year before birth | 1.02 (0.94, 1.11) | 1.04 (0.99, 1.10) | −0.03 (− 0.12, 0.06) | 1.07 (0.83, 1.38) | 0.93 (0.81, 1.08) | −0.06 (− 0.15, 0.04) |
 Entire pregnancy | 1.01 (0.93, 1.10) | 1.03 (0.98, 1.08) | −0.03 (− 0.12, 0.06) | 1.01 (0.88, 1.15) | 0.92 (0.85, 1.00) | −0.01 (− 0.10, 0.08) |
 First trimester | 1.00 (0.94, 1.07) | 1.01 (0.97, 1.05) | 0.00 (−0.08, 0.08) | 0.99 (0.92, 1.07) | 0.99 (0.94, 1.04) | 0.04 (−0.04, 0.11) |
 Second trimester | 0.98 (0.92, 1.05) | 1.01 (0.97, 1.05) | 0.03 (−0.05, 0.11) | 0.97 (0.90, 1.05) | 0.95 (0.91, 0.99) | 0.01 (−0.07, 0.09) |
 Third trimester | 1.03 (0.96, 1.10) | 1.03 (0.99, 1.07) | −0.02 (− 0.10, 0.06) | 1.03 (0.95, 1.11) | 1.00 (0.96, 1.05) | −0.01 (− 0.09, 0.07) |