Table 1. Descriptions of daily HFMD cases, meteorological factors and air pollutants in the basin area of Sichuan Province from January 1, 2015, to December 31, 2017.
| Variable | Mean± SD | Median (IQR) | Range |
|---|---|---|---|
| HFMD (cases) | 183.4±100.6 | 176.0 (104.0, 244.0) | (3.0, 517.0) |
| Air pollutants | |||
| PM10 (μg/m3) | 79.8±49.1 | 68.0 (45.0, 103.0) | (6.0, 599.0) |
| PM2.5 (μg/m3) | 49.9±35.7 | 40.0 (25.0, 65.0) | (2.0, 370.0) |
| SO2 (μg/m3) | 14.5±8.5 | 13.0 (9.0, 18.0) | (1.0, 112) |
| NO2 (μg/m3) | 30.5±12.7 | 29.0 (21.0, 38.0) | (4.0, 112.0) |
| O3 (μg/m3) | 62.3±35.0 | 56.0 (37.0, 81.0) | (2.0, 242.0) |
| CO (mg/m3) | 0.9±0.3 | 0.8 (0.6, 1.0) | (0.1, 4.0) |
| AQI | 78.1±41.2 | 67.0 (51.0, 94.0) | (14.0, 399) |
| Meteorological factors | |||
| Tm (°C) | 18.1±7.3 | 18.6 (11.3, 24.1) | (-2.2, 36.1) |
| Humid (%) | 77.4±12.1 | 78.0 (69.0, 87.0) | (20.0, 100.0) |
| Win (m/s) | 1.4±0.6 | 1.3 (1.0, 1.7) | (0.0, 6.4) |
| Sun (h) | 3.3±3.9 | 1.2 (0.0, 6.6) | (0.0, 13.3) |
| Rain(mm) | 2.8±9.3 | 0.0 (0.0, 1.3) | (0.0, 266.7) |
| City-specific indicators | |||
| Population density (people per km2) | 449.8±249.1 | 419.1 (269.9, 596.1) | (102.3, 1146.2) |
| Proportion of students (‰) | 62.9±12.9 | 58.1 (54.1, 73.7) | (49.5, 92.9) |
| Birth rate (‰) | 9.9±0.7 | 9.8 (9.5, 10.2) | (8.6, 11.3) |
| GDP per person (CNY) | 37,095.6±13,516.0 | 35676.7(31,106.0, 38,990.3) | (16,543, 79,381.3) |
| GDP increase (%) | 17.0±10.3 | 19.9 (15.9, 21.1) | (-19.5, 28.6) |
| Urbanization rate (%) | 46.6±7.3 | 46.6 (42.4, 48.7) | (38.8, 71.3) |
| Hospital beds(per 1000 population) | 2.6±0.4 | 2.6 (2.3, 2.8) | (1.9, 3.4) |
| Licensed physicians (per 1000 population) | 7.6±1.4 | 7.5 (6.6, 8) | (6.2, 12.1) |
| Passengers (trips) | 3,055,310.9±251,066.8 | 234,231.0(165,834.0, 293,041.0) | (911,55.0, 1,167,754.0) |