Table 1 Characteristics of research data
Items | Number of participants |
|---|---|
All participants | 7682 |
Gender of participants, no. (%) | |
 Male | 5689 (74.1%) |
 Female | 1993 (25.9%) |
Age of participants, mean (SD), years | 47.7 (13.8) |
Age groups of participants, no. (%) | |
 < 18 years | 45 (0.6%) |
 18–44 years | 4018 (52.3%) |
 45–64 years | 2636 (34.3%) |
 ≥ 65 | 983 (12.8%) |
BMI of participants, mean (SD), kg/m2 | 24.4 (3.2) |
BMI groups of participants, no. (%) | |
 Low weight (< 18.5) | 243 (3.2%) |
 Normal (18.5–23.9) | 3340 (43.5%) |
 Overweight (24–27.9) | 2993 (39.0%) |
 Obesity (≥ 28) | 1106 (14.4%) |
City groups of participants, no. (%) | |
 Super first-tier cities | 2426 (31.6%) |
 First-tier cities | 1811 (23.6%) |
 Second-tier cities | 1488 (19.4%) |
 Third-tier cities | 960 (12.5%) |
 Fourth-tier cities | 690 (9.0%) |
 Fifth-tier cities | 307 (4.0%) |
Altitude groups of participants, no. (%) | |
 ≥ 1000 m | 389 (5.1%) |
 < 1000 m | 7293 (94.9%) |
Smoking, no. (%) | |
 Never | 5338 (69.5%) |
 Occasional | 929 (12.1%) |
 Regular | 345 (4.5%) |
 Daily | 1070 (13.9%) |
Drinking, no. (%) | |
 Never | 2300 (29.9%) |
 Occasional | 4419 (57.5%) |
 Regular | 774 (10.1%) |
 Daily | 189 (2.5%) |
Total nights of sleep tracking, no. | 1005 |
Accumulative sleep records, nights | 1,245,817 |
Type of the night sleep records tracked in, no. (%) | |
 Weeknights | 879,289 (70.6%) |
 Nights of rest day | 366,528 (29.4%) |
Seasons sleep records tracked in, no. (%) | |
 Spring (March to May) | 326,332 (26.2%) |
 Summer (June to August) | 284,066 (22.8%) |
 Autumn (September to November) | 346,791 (27.8%) |
 Winter (December to February) | 288,628 (23.2%) |