Results of the ultrasound and child health care (CHC) screening for developmental dysplasia of the hip (DDH) in modified two by two tables
| DDH+ | DDH− | Total | ||
|---|---|---|---|---|
| Screen detected | Not screen detected | |||
| Ultrasound screening + | 239 | 4 | 149 | 392 |
| Ultrasound screening − | 0 | 27 | 4751 | 4778 |
| Total | 239 | 31 | 4900 | 5170 |
| CHC screening + | 55 | 7 | 335 | 397 |
| CHC screening − | 0 | 10 | 1659 | 1669 |
| Total | 55 | 27 | 1994 | 2066 |