TOTAL

(n = 453)

COMPLETE

(n = 393)

INCOMPLETE

(n = 60)

p

Mother’s age at birth

Average

27.1 ± 5.9

27.1 ± 5.8

27.1 ± 6.1

ns

Median

27

27

27

Father’s age at birth

Average

33.4 ± 7.2

33.2 ±7.2

34.2 ± 7.3

ns

Median

33

33

34

Mother’s activity

Pupil/Student

148

32.70%

125

31.80%

23

38.40%

0.04

Graduate student

56

12.40%

53

13.50%

3

5.00%

0.679

Unoccupied

112

24.70%

100

25.40%

12

20.00%

0.23

Liberal

43

9.60%

38

9.70%

5

8.30%

0.417

Employee

94

20.80%

77

19.60%

17

28.30%

0.053

Father’s activity

Pupil/Student

36

7.90%

32

8.10%

4

6.70%

0.479

Graduate student

26

5.70%

25

6.30%

1

1.70%

0.84

Unoccupied

18

4.00%

12

3.10%

5

8.30%

0.083

Liberal

123

27.20%

109

27.80%

14

23.30%

0.18

Employee

250

55.20%

215

54.70%

36

60.00%

0.28