Table 1 Characteristics of survey participants

Sex

Girls

11,322

47.2

11,867

47.7

11,758

47.4

Boys

12,675

52.8

12,983

52.3

13,030

52.6

Age 

≤ 6.0 years

15,077

62.9

15,049

60.6

13,729

55.4

< 7.0 years

8,689

36.2

9,550

38.4

10,753

43.4

> 7.0 years

231

0.96

251

1.0

306

1.2

SEP index

High

9,853

41.1

10,802

43.5

10,966

44.3

Middle

9,473

39.4

9,277

37.3

8,756

35.3

Low

2,050

8.5

1,930

7.7

1,766

7.1

Missing information

2,621

10.9

2,841

11.4

3,300

13.3

Native language

German

21,308

88.8

22,055

88.7

21,542

86.9

Other (mb)

1,236

5.2

1,338

5.4

1,559

6.3

Bilingual

884

3.7

770

3.1

896

3.6

Missing information

569

2.4

687

2.8

791

3.2

Kindergarten 

< 4 years

n.a

n.a

4,789

19.3

2,362

9.5

 > 4 years

n.a

n.a

17,285

69.6

19,927

80.4

Missing information

n.a

n.a

2,776

11.2

2,499

10.1