Table 1 Descriptive statistics of depression outpatient visits and environmental factors in Suzhou, 2017–2019
Variables | Total | Mean ± SD | Min | P25 | Median | P75 | Max |
|---|---|---|---|---|---|---|---|
Depression cases | 26,343 | 24.1 ± 8.2 | 4 | 19 | 25 | 30 | 40 |
Gender | |||||||
 Female | 10,499 | 9.6 ± 4.2 | 0 | 7 | 10 | 13 | 21 |
 Male | 15,844 | 14.5 ± 5.5 | 4 | 10 | 12 | 20 | 21 |
Age | |||||||
  ≤ 18 years | 2198 | 2.0 ± 2.4 | 0 | 0 | 1 | 3 | 8 |
 19–39 years | 8083 | 7.4 ± 2.6 | 0 | 6 | 7 | 9 | 15 |
 40–64 years | 10,889 | 9.9 ± 2.5 | 2 | 9 | 10 | 12 | 17 |
  ≥ 65 years | 5173 | 4.7 ± 3.3 | 0 | 1 | 4 | 8 | 9 |
Visit types | |||||||
 First visit | 12,567 | 11.5 ± 5.5 | 1 | 7 | 9 | 17 | 18 |
 Multiple visits | 13,776 | 12.6 ± 4.2 | 2 | 10 | 13 | 16 | 24 |
Weather conditions | |||||||
 Rainfall (mm) | / | 2.4 ± 10.7 | 0.0 | 0.0 | 0.0 | 0.0 | 232.6 |
Mean temperature (°C) | / | 15.8 ± 9.9 | −6.3 | 6.8 | 16.3 | 24.7 | 34.4 |
Relative humidity (%) | / | 73.6 ± 13.9 | 27.0 | 64.0 | 75.0 | 84.0 | 99.0 |
Sunshine duration (h) | / | 5.8 ± 4.3 | 0.0 | 0.8 | 7.1 | 9.4 | 12.8 |
Air pollutants | |||||||
 PM2.5 (μg/m3) | / | 58.0 ± 36.7 | 0.0 | 32.0 | 49.0 | 75.0 | 250.0 |
 NO2 (μg/m3) | / | 34.5 ± 17.9 | 5.0 | 22.0 | 31.0 | 45.0 | 121.0 |
 SSO2 (μg/m3) | / | 13.6 ± 8.1 | 3.0 | 8.0 | 12.0 | 17.0 | 70.0 |