Table 2 Sample description

Zygosity: monozygotic

49%

47%

Birth cohorts

Cohort 2: 2003/2004

46%

45%

Cohort 3: 1997/1998

30%

31%

Cohort 4: 1990–1993

24%

24%

Gender: female

56%

55%

Spatial area: > = 50.000 core area

68%

70%

Eastern federal states

18%

17%

Single household

12%

18%

Highest educational level of mother of twins

15.153

2.190

14.928

2.401

Income position of household

Risk of poverty/low-income middle class (< = 80% of median of net equivalent income)

31%

33%

Middle class (> 80–120%)

34%

31%

Upper/high-income (> 120%)

24%

30%

Information on income is missing

11%

6%

TwinLife subsample A

67%

54%

Month of interview since start of data collection

2.089

1.145

2.887

1.699

Observations

798

2520

N twin pairs

399

1260