| Age Group | DDH findings 1st Visit | DDH findings 2nd Visit | ||
| Positive | Negative | Positive | Negative | |
| From 1 to 2 months | 16 (5.9%) | 20 (7.0%) | 6 (3.2%) | 18 (9.7%) |
| From 2 to 4 months | 99 (36.0%) | 96 (34.9%) | 19 (10.2%) | 113 (60.8%) |
| From 4 to 5 months | 20 (7.0%) | 9 (3.2%) | 6 (3.2%) | 13 (7.0%) |
| From 5 to 6 months | 15 (5.4%) | 1 (0.5%) | 4 (2.2%) | 7 (3.8%) |
| Total | 150 (54.3%) | 126 (45.7%) | 35 (18.8%) | 151 (81.2%) |