Table 1. Number of cases according to age and sex (n=209).
| Study group age | Age (mo) | Sex, n (%) | Total | |
|---|---|---|---|---|
| Male | Female | |||
| 1st (4–6 mo) | 4–6 | 3 (75.0) | 1 (25.0) | 4 |
| 6–7 | 3 (75.0) | 1 (25.0) | 4 | |
| Total | 6 (75.0) | 2 (25.0) | 8 | |
| 2nd (9–12 mo) | 8–9 | 4 (30.8) | 9 (69.2) | 13 |
| 10–11 | 15 (48.4) | 16 (51.6) | 31 | |
| 12–13 | 13 (61.9) | 8 (38.1) | 21 | |
| 14–15 | 1 (50.0) | 1 (50.0) | 2 | |
| 16–17 | 1 (50.0) | 1 (50.0) | 2 | |
| Total | 34 (49.3) | 35 (50.7) | 69 | |
| 3rd (18–24 mo) | 18–19 | 8 (53.3) | 7 (46.7) | 15 |
| 20–21 | 6 (66.7) | 3 (33.3) | 9 | |
| 22–23 | 2 (22.2) | 7 (77.8) | 9 | |
| 24–26 | 10 (71.4) | 4 (28.6) | 14 | |
| 27–29 | 3 (100) | 0 (0) | 3 | |
| Total | 29 (58.0) | 21 (42.0) | 50 | |
| 4th (30–36 mo) | 30–32 | 14 (87.5) | 2 (12.5) | 16 |
| 33–35 | 7 (63.6) | 4 (36.4) | 11 | |
| 36–41 | 10 (66.7) | 5 (33.3) | 15 | |
| Total | 31 (73.8) | 11 (26.2) | 42 | |
| 5th (42–48 mo) | 42–47 | 8 (61.5) | 5 (38.5) | 13 |
| 48–53 | 3 (75.0) | 1 (25.0) | 4 | |
| Total | 11 (64.7) | 6 (35.3) | 17 | |
| 6th (54–60 mo) | 54–59 | 8 (88.9) | 1 (11.1) | 9 |
| 60–65 | 2 (66.7) | 1 (33.3) | 3 | |
| Total | 10 (83.3) | 2 (16.7) | 12 | |
| 7th (66–71 mo) | 66–71 | 6 (54.5) | 5 (45.5) | 11 |
| Total | 127 (60.8) | 82 (39.2) | 209 | |