1 = health controls
2 = depression

1 = men
2 = women

1 = Han
2 = Zhuang

1 = Single
2 = Married
3 = Divorced or widowed

2 = <6 years
3 = 6-9 years
4 = ≥9 years

1 = 0-999
2 = 1000-1999
3 = 2000-2999
4 = ≥3000