Table 4.
Characteristics of different types of mental disability by wealth index quintiles a.
| Variable | Wealth Index | p trend | ||||
|---|---|---|---|---|---|---|
| Q1 (Lowest) | Q2 | Q3 | Q4 | Q5 (Highest) | ||
| Types of mental disability | ||||||
| Organic mental disorders, n | 227 | 121 | 98 | 90 | 48 | |
| Age of mental disability onset, mean (years) | 25.8 | 28.8 | 31.1 | 34.8 | 35.0 | <0.01 |
| Duration of mental disability, mean (years) | 16.4 | 14.7 | 13.6 | 12.7 | 12.9 | 0.01 |
| Mental disorders due to psychoactive substance use, n | 96 | 63 | 54 | 46 | 33 | |
| Age of mental disability onset, mean (years) | 35.8 | 37.8 | 33.9 | 35.4 | 40.2 | 0.42 |
| Duration of mental disability, mean (years) | 12.7 | 12.1 | 12.9 | 12.9 | 9.5 | 0.36 |
| Schizophrenia, schizotypal and delusional disorders, n | 2731 | 1460 | 1016 | 796 | 660 | |
| Age of mental disability onset, mean (years) | 28.2 | 28.1 | 28.3 | 29.0 | 30.6 | <0.01 |
| Duration of mental disability, mean (years) | 14.5 | 13.5 | 14.0 | 13.9 | 13.4 | 0.01 |
| Mood disorders, n | 187 | 153 | 124 | 101 | 107 | |
| Age of mental disability onset, mean (years) | 32.1 | 34.1 | 35.3 | 37.3 | 38.4 | <0.01 |
| Duration of mental disability, mean (years) | 12.3 | 11.4 | 9.6 | 8.5 | 8.7 | <0.01 |
| Neurotic stress-related and somatoform disorders, n | 194 | 128 | 107 | 91 | 65 | |
| Age of mental disability onset, mean (years) | 34.5 | 36.3 | 36.9 | 36.9 | 38.4 | 0.01 |
| Duration of mental disability, mean (years) | 11.9 | 11.3 | 9.6 | 9.9 | 9.3 | 0.01 |
| Behavior syndromes, n | 20 | 12 | 14 | 9 | 8 | |
| Age of mental disability onset, mean (years) | 29.4 | 29.6 | 41.4 | 43.9 | 33.3 | 0.04 |
| Duration of mental disability, mean (years) | 13.5 | 16.5 | 6.3 | 8.7 | 10.1 | 0.08 |
| Disorder of adult personality and behavior, n | 48 | 15 | 5 | 12 | 11 | |
| Age of mental disability onset, mean (years) | 24.9 | 21.5 | 19.4 | 19.3 | 23.1 | 0.34 |
| Duration of mental disability, mean (years) | 17.9 | 19.8 | 16.2 | 12.9 | 13.1 | 0.12 |
| Epilepsy, n | 371 | 194 | 150 | 101 | 41 | |
| Age of mental disability onset, mean (years) | 20.0 | 19.3 | 20.5 | 19.5 | 19.3 | 0.88 |
| Duration of mental disability, mean (years) | 19.6 | 17.8 | 17.9 | 18.0 | 19.7 | 0.27 |
| Others, n | 143 | 62 | 50 | 28 | 5 | |
| Age of mental disability onset, mean (years) | 28.6 | 23.9 | 28.2 | 22.2 | 36.2 | 0.33 |
| Duration of mental disability, mean (years) | 15.5 | 19.0 | 14.5 | 15.2 | 5.6 | 0.39 |
a Based on linear regression analysis for continuous variables and the Mantel-Haenszel chi-square test and Mantel-Haenszel exact chi-square test for categorical variables, with ordinal scores assigned to the quintile categories.