Regions

Range of

1 to 5 years

6 to 10 years old

11 to 15 years old

16 to 20 years old

More than 20 years

Dosso

61

18

1

7

1

Maradi

67

20

4

5

0

Tahoua

44

28

3

5

6

Zinder

69

23

2

3

1

Average

60 ± 0.1

22 ± 0.04

3 ± 0.01

5 ± 0.02

3 ± 0.03

Chi-square

*

ns

ns

ns

**