Table 2 Frequency of NSD (%) in relation to age and sex in the studied age-groups.

Male

Female

Group I

Infants I (5-7 yr)

9 (21.4%)

5 (11.9%)

Group II

Infant II (8-14 yr)

15 (27.7%)

10 (18.5%)

Group III

Juvenial (15-22 yr)

19 (33.3%)

11 (10.9%)

Group IV

Adult I (23-35 yr)

11 (25.6%)

7 (6.9%)

Group V

Adult II (36-45 yr)

6 (25.0%)

5 (20.8%)

Group VI

Adult III (> 45 yr)

2 (2.0%)

1 (1.0%)