Table 2.
Concentration of Exposure to Air Pollutants in the First and Second Trimester of Pregnancy
| PE group (N = 2988) |
non-PE group (N = 113,054) |
Z | P | |
|---|---|---|---|---|
| PM2.5(μg/m3) | ||||
| Trimester 1 | 72.67 (61.33, 111.67) | 71.33 (55.67, 107.67) | −6.818 | < 0.001 |
| Trimester 2 | 70.67 (58.33, 106.67) | 68.67 (54.67, 99.67) | −7.424 | < 0.001 |
| PM10(μg/m3) | ||||
| Trimester 1 | 139.00 (107.67, 181.33) | 135.33 (101.00, 169.67) | −7.293 | < 0.001 |
| Trimester 2 | 135.00 (106.67, 169.67) | 134.67 (99.00, 160.67) | −6.464 | < 0.001 |
| NO2 (μg/m3) | ||||
| Trimester 1 | 52.33 (40.00, 63.33) | 51.67 (39.67, 63.33) | −2.753 | 0.006 |
| Trimester 2 | 50.67 (39.67, 64.00) | 50.67 (39.67, 63.33) | −3.248 | 0.001 |
| SO2 (μg/m3) | ||||
| Trimester 1 | 37.33 (23.00, 53.67) | 36.67 (23.33, 53.67) | −1.344 | 0.179 |
| Trimester 2 | 33.33 (21.67, 50.33) | 33.33 (22.00, 49.00) | −2.036 | 0.052 |
| CO (mg/m3) | ||||
| Trimester 1 | 2.23 (1.40, 3.87) | 2.37 (1.50, 3.80) | −1.300 | 0.194 |
| Trimester 2 | 2.10 (1.40, 3.87) | 2.13 (1.40, 3.70) | −0.545 | 0.586 |
| O3 (μg/m3) | ||||
| Trimester 1 | 132.67 (86.00, 174.67) | 126.00 (81.67, 170.33) | −5.130 | < 0.001 |
| Trimester 2 | 145.67 (86.00, 182.00) | 135.67 (82.67, 180.67) | −2.481 | 0.013 |
The concentration of exposure to air pollutants were presented as median (interquartile ranges); The difference was analyzed using One-way ANOVA for normally distributed variables and Kruskal-Wallis H test for non-normally distributed variables. Trimester 1 the first trimester of pregnancy, Trimester 2 the second trimester of pregnancy, PE preeclampsia