Table 1.
Demographic and baseline characteristics of the 20% subsample that completed the SF-36 and ESS questionnaire, compared with the full study population.
| Entire SILC study population N = 16 078 |
20% subsample N = 3214 |
|
|---|---|---|
| n (%) | n (%) | |
| Region | ||
| Urban | 8072 (50.2) | 1585 (49.3) |
| Rural | 8006 (49.8) | 1629 (50.7) |
| Sex | ||
| Female | 8390 (52.2) | 1678 (52.2) |
| Male | 7688 (47.8) | 1536 (47.8) |
| Age (years) | ||
| 18-29 | 3680 (22.9) | 749 (23.3) |
| 30-39 | 3675 (22.9) | 736 (22.9) |
| 40-49 | 3812 (23.7) | 757 (23.6) |
| 50-59 | 2468 (15.4) | 486 (15.1) |
| 60-69 | 1503 (9.3) | 309 (9.6) |
| 70-80 | 940 (5.8) | 177 (5.5) |
| Smokers | 4431 (27.6) | 859 (26.7) |
| Alcohol consumption (any) | 3262 (20.3) | 684 (21.3) |
| Body mass index (kg/m2; mean ± SD) | 22.6 ± 3.3 | 22.6 ± 3.4 |
ESS, Epworth Sleepiness Scale; SD, standard deviation; SF-36, 36-item Short-Form Health Survey; SILC, Systematic Investigation of Gastrointestinal Diseases in China.