Table 1.
Summary statistics for daily clinic consultations, concentrations of SPM, airborne pollen and meteorological variables by the presence of AD
| AD-affected days | AD-free days | P-value for difference | |
|---|---|---|---|
| Total number of days | 238 | 3392 | |
| Median (range) per year | 7 (1, 26) | 82 (63, 89) | |
| Clinic consultation [mean (SD)] | |||
| Clinic I | 8.4 (9.9) | 8.7 (10.4) | 0.65 |
| Clinic II | 7.7 (8.7) | 8.8 (9.0) | 0.14 |
| Clinic III | 11.9 (12.4) | 12.3 (13.3) | 0.73 |
| Clinic IV | 4.6 (7.0) | 5.2 (6.8) | 0.39 |
| SPM (μg/m3) | |||
| Mean (SD) | 58.9 (32.2) | 29.4 (13.4) | <0.01 |
| Median (IQR) | 52.7 (40.2, 67.6) | 26.8 (19.8, 36.0) | |
| 10th, 90th centile | 28.6, 88.3 | 15.3, 47.1 | |
| Days missing (%)a | 10 (1.5) | 174 (2.7) | |
| Pollen (grain/cm2) | |||
| Mean (SD) | 45.5 (110.4) | 30.1 (77.2) | 0.06 |
| Median (IQR) | 3.5 (0.8, 23.1) | 3.0 (0.5, 18.5) | |
| 10th, 90th centile | 0, 153 | 0, 90 | |
| Days missing (%)a | 0 (0) | 53 (0.8) | |
| Temperature (°C) | |||
| Mean (SD) | 13.9 (3.2) | 11.0 (4.2) | <0.01 |
| Relative humidity (%) | |||
| Mean (SD) | 58.3 (10.7) | 63.5 (13.1) | <0.01 |
AD Asian dust, SPM suspended particulate matter, SD standard deviation, IQR interquartile range
aTotal for four clinics