Supplementary Table 1. Effect of exposure to both PM2.5 and ETS according to exposure time on susceptibility to respiratory tract infections in infancy.
| LRTIs | URTIs | |||||
|---|---|---|---|---|---|---|
| No | Yes | aOR* (95% CI) | No | Yes | aOR* (95% CI) | |
| n (%) | n (%) | n (%) | n (%) | |||
| Prenatal PM2.5 (Low) | 68 (22.8) | 5 (8.3) | 1.00 | 17 (22.1) | 57 (19.5) | 1.00 |
| Prenatal ETS (No) | ||||||
| Prenatal PM2.5 (Low) | 97 (32.6) | 22 (36.7) | 2.68 (0.84, 8.61) | 27 (35.1) | 96 (32.9) | 1.06 (0.50, 2.23) |
| Prenatal ETS (Yes) | ||||||
| Prenatal PM2.5 (High) | 54 (18.1) | 10 (26.7) | 2.27 (0.62, 8.34) | 13 (16.9) | 54 (18.5) | 1.14 (0.48, 2.70) |
| Prenatal ETS (No) | ||||||
| Prenatal PM2.5 (High) | 79 (26.5) | 23 (38.3) | 6.56 (2.02, 21.24) | 20 (26.0) | 85 (29.1) | 1.46 (0.65, 3.30) |
| Prenatal ETS (Yes) | ||||||
| Total | 298 | 60 | 77 | 292 | ||
| Prenatal PM2.5 (Low) | 86 (37.2) | 17 (31.5) | 1.00 | 22 (40.0) | 85 (35.1) | 1.00 |
| Postnatal ETS (No) | ||||||
| Prenatal PM2.5 (Low) | 41 (17.7) | 6 (11.1) | 0.88 (0.30, 2.59) | 9 (16.4) | 40 (16.5) | 1.21 (0.47, 3.08) |
| Postnatal ETS (Yes) | ||||||
| Prenatal PM2.5 (High) | 73 (31.6) | 22 (40.7) | 1.92 (0.85, 4.36) | 17 (30.9) | 81 (33.5) | 1.40 (0.64, 3.04) |
| Postnatal ETS (No) | ||||||
| Prenatal PM2.5 (High) | 31 (13.4) | 9 (16.7) | 2.05 (0.69, 6.08) | 7 (12.7) | 36 (14.9) | 1.25 (0.43, 3.67) |
| Postnatal ETS (Yes) | ||||||
| Total | 231 | 54 | 55 | 242 | ||
| Postnatal PM2.5 (Low) | 43 (22.4) | 7 (21.2) | 1.00 | 16 (22.9) | 36 (22.5) | 1.00 |
| Prenatal ETS (No) | ||||||
| Postnata PM2.5 (Low) | 56 (29.2) | 11 (33.3) | 2.06 (0.54, 7.86) | 24 (34.3) | 43 (26.9) | 1.18 (0.46, 3.07) |
| Prenatal ETS (Yes) | ||||||
| Postnata PM2.5 (High) | 34 (17/7) | 7 (21.2) | 2.09 (0.49, 9.02) | 13 (18.6) | 29 (18.1) | 0.79 (0.28, 2.25) |
| Prenatal ETS (No) | ||||||
| Postnata PM2.5 (High) | 59 (30.7) | 8 (24.2) | 1.12 (0.27, 4.63) | 17 (24.3) | 52 (32.5) | 1.29 (0.49, 3.38) |
| Prenatal ETS (Yes) | ||||||
| Total | 192 | 33 | 70 | 160 | ||
| Postnatal PM2.5 (Low) | 51 (31.9) | 8 (29.6) | 1.00 | 19 (31.7) | 41 (31.8) | 1.00 |
| Postnatal ETS (No) | ||||||
| Postnatal PM2.5 (Low) | 31 (19.4) | 6 (22.2) | 2.54 (0.60, 10.83) | 17 (28.3) | 20 (15.5) | 0.59 (0.20, 1.73) |
| Postnatal ETS (Yes) | ||||||
| Postnatal PM2.5 (High) | 54 (33.8) | 8 (29.6) | 1.15 (0.28, 4.64) | 20 (33.3) | 42 (32.6) | 0.65 (0.26, 1.63) |
| Postnatal ETS (No) | ||||||
| Postnatal PM2.5 (High) | 24 (15.0) | 5 (18.5) | 2.29 (0.49, 10.78) | 4 (6.7) | 26 (20.2) | 1.95 (0.44, 8.72) |
| Postnatal ETS (Yes) | ||||||
| Total | 160 | 27 | 60 | 129 | ||
*Odds ratios were adjusted for maternal age, maternal body mass index, maternal educational state, infant sex, gestational age, delivery mode, and family history of allergy.
aOR, adjusted odds ratio; CI, confidence interval; ETS, environmental tobacco smoke; PM2.5, fine particulate matter; LRTIs, lower respiratory tract infections; URTIs, upper respiratory tract infections.