表 1. Basic characteristics of Chengdu's rural-urban migrant population (n=3091) .
成都市乡城流动人口基本情况（n=3091）
| Variable | Value | Variable | Value | |
| Mental component summary/score, median (P25-P75) | 49.06 (41.56-55.54) | Illness within four weeks/case (%) | ||
| Gender/case (%) | No | 2152 (69.62) | ||
| Male | 1546 (50.02) | Yes | 939 (30.38) | |
| Female | 1545 (49.98) | Hospitalization in the last year/case (%) | ||
| Age/yr., median (P25-P75) | 40 (27-50) | No | 2876 (93.04) | |
| Year/case (%) | Yes | 215 (6.96) | ||
| 2009 | 965 (31.22) | Wage arrears/case (%) | ||
| 2018 | 2126 (68.78) | No | 2814 (91.04) | |
| Marital status/case (%) | Yes | 277 (8.96) | ||
| Unmarried/Divorced/Widowed | 835 (27.01) | Overtime work/case (%) | ||
| Married | 2256 (72.99) | No | 1288 (41.67) | |
| Education level/case (%) | Yes | 1803 (58.33) | ||
| Primary school and below | 981 (31.74) | Monthly wage/case (%) | ||
| Junior middle school | 1186 (38.37) | Minimum wage and above | 2820 (91.23) | |
| Senior high school and beyond | 924 (29.89) | Below minimum wage | 271 (8.96) | |
| Drinking/case (%) | Job satisfaction/score, median (P25-P75) | 4 (3-4) | ||
| No alcohol consumption | 1810 (58.56) | Housing source/case (%) | ||
| Less than 1 time per week | 607 (19.64) | Renting houses | 2812 (90.97) | |
| 1-2 times per week | 286 (9.25) | Self-buyers | 279 (9.03) | |
| At least 3 times per week | 388 (12.55) | Monthly housing costs/case (%) | ||
| Smoking/case (%) | No housing costs | 817 (26.43) | ||
| Never smoked/quitted smoking | 2071 (67.00) | Have housing costs and less than monthly wage | 2208 (71.43) | |
| Non-daily smoking | 166 (5.37) | Have housing costs and higher than monthly wage | 66 (2.14) | |
| Daily Smoking | 854 (27.63) | Housing condition/score, median (P25-P75) | 4 (2-6) | |
| Number of children living with parents (median [P25-P75]) | 0 (0-1) |