Table 1 Summary statistics of singleton PTBs, daily weather conditions and air pollutants in Shenzhen
Variable | Mean(SD) | Min | P25 | P50 | P75 | Max |
|---|---|---|---|---|---|---|
Temperature (°C) | 23.14(5.56) | 5.4 | 19.2 | 24.5 | 27.8 | 32.7 |
Humidity (%) | 70.89(12.87) | 17 | 65 | 73 | 80 | 99 |
Atmospheric pressure (hpa) | 1006.07(6.61) | 985.7 | 1001.1 | 1005.90 | 1010.70 | 1029.10 |
NO2 (μg/m3) | 46.37(20.40) | 10.67 | 31.77 | 41.75 | 56.38 | 166.13 |
PM10 (μg/m3) | 61.11(32.19) | 12.38 | 35.75 | 53.88 | 80.17 | 411.50 |
SO2 (μg/m3) | 18.01(11.63) | 2.88 | 9.50 | 15.06 | 22.96 | 105.67 |
All PTBs | 22.85(7.98) | 4 | 17 | 22 | 28 | 49 |
Maternal age 15 ~ 19 group PTBs | 0.84(1.05) | 0 | 0 | 1 | 1 | 6 |
Maternal age 20 ~ 34 group PTBs | 18.94(7.10) | 3 | 14 | 18 | 24 | 46 |
Maternal age 35 ~ 49 group PTBs | 2.47(1.91) | 0 | 1 | 2 | 4 | 12 |
Male PTBs | 13.06(5.12) | 1 | 9 | 12 | 16 | 33 |
Female PTBs | 9.80(4.30) | 1 | 7 | 9 | 12 | 26 |
Vaginal delivery PTBs | 12.95(4.70) | 1 | 10 | 13 | 16 | 29 |
Cesarean section PTBs | 9.92(5.11) | 1 | 6 | 9 | 13 | 30 |