Table 1 Descriptive statistics (mean and SD) on the sleep-related indicators and weather conditions during the 24 hours prior to waking
Variables | Sleep duration < 7 h (N = 10,653,033) | Sleep duration ≥ 7 h (N = 12,544,012) | Overall (N = 23,197,045) |
|---|---|---|---|
Sleep duration | |||
Total sleep(min) | 354.4 (51.8) | 489.1 (59.0) | 427.3 (86.5) |
Light sleep (min) | 166.0 (38.2) | 228.5 (57.7) | 199.8 (58.7) |
Deep sleep (min) | 106.8 (32.7) | 144.2 (41.2) | 127.0 (41.9) |
Dream time (min) | 81.7 (25.7) | 116.4 (32.7) | 100.4 (34.4) |
Meteorological condition | |||
Temperature (°C) | 16.2 (9.7) | 14.0 (10.0) | 15.0 (9.9) |
Relative humidity (%) | 64.7 (19.1) | 63.8 (19.4) | 64.2 (19.3) |
Air pollution | |||
PM2.5 (μg/m3) | 31.5 (25.0) | 33.9 (26.8) | 32.8 (26.1) |
NO2 (μg/m3) | 26.5 (15.8) | 27.9 (16.3) | 27.2 (16.1) |
CO (mg/m3) | 0.65 (0.26) | 0.66 (0.27) | 0.66 (0.27) |
SO2 (μg/m3) | 7.3 (4.3) | 7.5 (4.4) | 7.4 (4.4) |
O3 (μg/m3) | 67.4 (32.3) | 63.5 (31.3) | 65.3 (31.8) |
