Table 1 Study sample

In years

A,B*

Single

Married

Berlin-Leipzig

Stuttgart-Zossen**

7–9

n = 2

yes = 2, no = 0

33

A = 2, B = 0

2

0

2

Berlin = 1

Zossen = 1

10–12

n = 2

yes = 0, no = 2

42

A = 0, B = 2

4

1

1

Berlin = 2

 > 12

n = 5

yes = 3, no = 2

42

A = 1, B = 4

1.4

1

4

Berlin = 3

Stuttgart = 1

Leipzig = 1

total

n = 9

yes = 5, no = 4

40

A = 5, B = 3

2.1

2

7

Berlin = 6

Other = 3