Table 3.
Socioeconomic characteristics of the Chinese population by wealth index quintiles a.
| Variable | Wealth Index | p trend | ||||
|---|---|---|---|---|---|---|
| Q1 (Lowest) | Q2 | Q3 | Q4 | Q5 (Highest) | ||
| Sample size of total population, n | 344,880 | 344,880 | 344,879 | 344,880 | 344,879 | |
| Sample size of mental disability, n | 4017 | 2208 | 1618 | 1274 | 978 | |
| Age of mental disability onset, mean (years) | 27.9 | 28.4 | 29.1 | 30.0 | 32.0 | <0.01 |
| Duration of mental disability, mean (years) | 14.9 | 13.8 | 13.6 | 13.4 | 12.7 | <0.01 |
| Male, % | 53.8 | 50.7 | 49.3 | 48.9 | 47.4 | <0.01 |
| Marital status, % | ||||||
| Never married | 22.3 | 20.6 | 20.5 | 17.7 | 19.3 | <0.01 |
| Divorced/widowed | 5.2 | 3.1 | 2.7 | 3.1 | 2.8 | <0.01 |
| Married | 72.5 | 76.3 | 76.8 | 79.2 | 77.9 | <0.01 |
| Urban, % | 2.6 | 9.0 | 23.0 | 53.8 | 88.4 | <0.01 |
| Han ethnicity, % | 75.4 | 88.6 | 92.4 | 93.4 | 94.5 | <0.01 |
| Education, % | ||||||
| Never attended school | 19.8 | 10.8 | 7.4 | 4.5 | 1.6 | <0.01 |
| Primary school | 41.8 | 34.6 | 27.5 | 19.1 | 8.3 | <0.01 |
| High school and above | 38.4 | 54.7 | 65.1 | 76.5 | 90.1 | <0.01 |
| House type | ||||||
| Bamboo, straw, and other | 44.2 | 17.4 | 6.5 | 2.1 | 0.3 | <0.01 |
| Masonry/timber and mixed | 54.9 | 79.4 | 85.7 | 85.9 | 74.7 | <0.01 |
| concrete | 0.8 | 3.2 | 7.9 | 12.0 | 25.1 | <0.01 |
| Homeownership owned, % | 97.3 | 94.1 | 89.7 | 85.5 | 82.1 | <0.01 |
| Living with others, % | 96.8 | 98.3 | 98.5 | 98.3 | 98.5 | <0.01 |
| Employed, % | 88.1 | 84.2 | 78.5 | 70.2 | 61.1 | <0.01 |
| Last year income, mean (Yuan) | 6092 | 9488 | 12753 | 17256 | 34373 | <0.01 |
a Based on linear regression analysis for continuous variables and the Mantel-Haenszel chi-square test for categorical variables, with ordinal scores assigned to the quintile categories.