Table 2.
Characteristics of children with acceptable spirometry grouped by the prenatal exposure to fine particulate matter (PM2.5)
| Total study sample |
Lower PM2.5 ≤52.6 µg/m3 |
Higher PM2.5 >52.6 µg/m3 |
P-value for difference between exposure groups |
||
|---|---|---|---|---|---|
| N=176 | N=131 | N=45 | |||
| Gender: Boys Girls |
n (%) n (%) |
87 (49.4) 89 (50.6) |
67 (51.1) 64 (48.9) |
21 (44.4) 29 (55.6) |
0.5466 |
| Gestational age (weeks): > 36 |
mean SD |
39.47 1.166 |
39.46 1.152 |
39.49 1.218 |
0.8787 |
| Birth weight (g): | mean SD |
3432.4 422.7 |
3460.8 432.8 |
3349.8 384.6 |
0.1288 |
| Length at birth (cm): | mean SD |
54.9 2.48 |
55.0 2.49 |
54.5 2.42 |
0.1943 |
| Age (in months) | mean SD |
60.7 0.92 |
60.7 0.97 |
60.7 0.75 |
0.9491 |
| Weight (kg) at age of 5 years (kg): |
mean SD |
19.83 2.885 |
19.87 2.840 |
19.73 3.041 |
0.7834 |
| Height (cm) at age of 5 years: | mean SD |
112.8 4.539 |
112.7 4.650 |
113.3 4.218 |
0.4439 |
| FVC (ml): | mean SD |
1124.8 194.1 |
1141.0 200.9 |
1077.7 165.9 |
0.0587 |
| FEV1 (ml): | mean SD |
1070.9 183.8 |
1084.7 187.9 |
1030.5 166.6 |
0.0878 |
| FEV0.5 (ml): | mean SD |
843.1 168.1 |
852.1 168.9 |
816.8 165.0 |
0.2250 |
| Wheezing | n (%) | 47 (26.7) | 34 (26.0) | 13 (28.9) | 0.8504 |
| ETS prenatal exposure | n (%) | 44 (25.0) | 30 (22.9) | 14 (31.1) | 0.3693 |
| ETS postnatal exposure | n (%) | 17 ( 9.7) | 7 (5.3) | 10 (22.2) | 0.0026 |