Table 3.
Mean average and mean changes in pulmonary function among pre-to-peak and pre-to-post-peak season periods.
| Parameters | Pre-peak season of ambient air pollution | Peak season of ambient air pollution | Mean changes | 95% CI | P-value* |
|---|---|---|---|---|---|
| Pre-to-peak season (January to March) n = 30 | |||||
| FVC, observed) (L) | 4.13 ± 0.85 | 3.84 ± 0.77 | − 0.28 ± 0.59 | − 0.50, − 0.06 | 0.013 |
| FVC, percent predicted (%) | 110.05 ± 17.79 | 102.39 ± 13.31 | − 7.86 ± 15.852 | − 13.78, − 1.94 | < 0.001 |
| FEV1, observed) (L) | 3.35 ± 0.71 | 3.14 ± 0.65 | − 0.21 ± 0.49 | − 0.39, − 0.03 | 0.025 |
| FEV1, percent predicted (%) | 107.69 ± 15.83 | 102.01 ± 12.75 | − 5.82 ± 13.63 | − 10.91, 0.73 | 0.002 |
| FEV1/FVC (%) | 81.32 ± 5.99 | 81.90 ± 6.20 | 0.58 ± 3.64 | − 0.78, 1.94 | 0.388 |
| FEF50, observed (L) | 4.61 ± 1.68 | 4.33 ± 1.56 | − 0.28 ± 1.15 | − 0.70, 0.15 | 0.201 |
| Pre-to-post-peak season (January to May) n = 20 | |||||
| FVC, observed) (L) | 4.00 ± 0.56 | 4.02 ± 0.65 | 0.10 ± 0.24 | − 0.02, 0.21 | 0.090 |
| FVC, percent predicted (%) | 103.58 ± 12.74 | 103.83 ± 14.42 | 0.25 ± 8.33 | − 3.65, 4.15 | 0.849 |
| FEV1, observed (L) | 3.31 ± 0.53 | 3.38 ± 0.53 | 0.06 ± 0.17 | − 0.02, 0.14 | 0.113 |
| FEV1, percent predicted (%) | 105.38 ± 13.79 | 105.54 ± 14.35 | 0.16 ± 6.92 | − 3.07, 3.40 | 0.879 |
| FEV1/FVC (%) | 82.85 ± 5.11 | 82.77 ± 5.64 | − 0.08 ± 2.11 | − 1.07, 0.90 | 0.865 |
| FEF50, observed (L) | 4.82 ± 1.67 | 4.72 ± 1.51 | − 0.10 ± 0.59 | − 0.38, 0.17 | 0.454 |
*Paired t-test. FVC forced vital capacity, FEF50 forced expiratory flow at 50% of the forced vital capacity, FEV1 forced expiratory volume in 1 s, L liters.
Significant values are in bold.