The baseline characteristics of participants according to snoring status among 482 413 participants
| Men | Women | |||
| Non-snoring | Habitual snoring | Non-snoring | Habitual snoring | |
| Participants, n (%) | 142 367 (71.7) | 56 153 (28.3) | 236 381 (83.3) | 47 512 (16.7) |
| Age (year) | 52.4 | 53.0 | 50.3 | 54.2 |
| Urban (%) | 40.2 | 47.1 | 43.2 | 46.2 |
| Middle school or above (%) | 57.3 | 58.0 | 43.9 | 42.8 |
| Married (%) | 92.2 | 94.8 | 89.3 | 89.7 |
| Household income ≥¥10 000/year (%) | 73.0 | 75.1 | 69.9 | 71.1 |
| Current daily smoker (%) | 67.2 | 69.9 | 2.6 | 3.1 |
| Current weekly alcohol consumer (%) | 32.5 | 35.8 | 2.0 | 2.5 |
| BMI (kg/m2) | 22.9 | 24.4 | 23.4 | 25.3 |
| Waist circumference (cm) | 80.5 | 84.8 | 77.9 | 82.7 |
| Physical activity (MET-hour/day) | 22.4 | 22.3 | 20.8 | 20.4 |
| Sleep duration (hours) | 7.4 | 7.5 | 7.3 | 7.5 |
| Always taking a daytime nap (%) | 23.1 | 25.1 | 17.3 | 19.8 |
| Postmenopause (%) | – | – | 50.7 | 51.1 |
| Family history of diabetes (%) | 5.5 | 7.0 | 6.3 | 8.0 |
| Prevalent hypertension (%) | 33.7 | 42.8 | 30.0 | 40.1 |
| Prevalent stroke or transient ischemic attack (%) | 2.0 | 2.6 | 1.0 | 1.6 |
| Prevalent coronary heart disease (%) | 2.2 | 3.0 | 2.6 | 3.8 |
| Regular fresh vegetable consumer* (%) | 98.0 | 98.8 | 98.2 | 98.7 |
| Regular fresh fruit consumer* (%) | 22.8 | 22.8 | 31.8 | 32.4 |
| Regular meat consumer* (%) | 50.0 | 53.7 | 43.5 | 45.7 |
Values of variables except age and urban were adjusted for age at study date and study regions, when appropriate.
*Regular consumers were referred to those consuming corresponding foods at least four times a week.
BMI, body mass index; MET, metabolic equivalent.