Table 6.
Baseline characteristics stratified by final AVN status
| Variable | AVN (n = 8) | No AVN (n = 42) | p value* |
|---|---|---|---|
| Gender | 1.000 | ||
| Male (%) | 1 (13) | 5 (12) | |
| Female (%) | 7 (87) | 37 (88) | |
| Affected side | 1.000 | ||
| Left (%) | 6 (75) | 31 (74) | |
| Right (%) | 2 (25) | 11 (26) | |
| Age at reduction, median months (IQR) | 5 (4–7) | 7 (5–10) | 0.218 |
| Weight at reduction, median kilograms (IQR) | 6.1 (5.9–7.3) | 7.3 (6.4–8.7) | 0.112 |
| Presence of ossific nucleus at reduction (%) | 2 (25) | 24 (57) | 0.132 |
| Previous treatment: either Pavlik or abduction brace (%) | 5 (63) | 26 (62) | 1.000 |
| Previous treatment: abduction brace after failed Pavlik (%) | 1 (20) | 12 (46) | 1.000 |
| Adductor tenotomy (%) | 4 (50) | 17 (40) | 0.706 |
| Abduction angle, mean degrees (SD) | 49.8 (± 5.8) | 54.8 (± 7.0) | 0.053 |
* p values correspond to intergroup differences based on the Fisher’s exact test for categorical variables, Student’s t-test for normally distributed continuous variables, and Mann-Whitney U test for nonnormally distributed continuous variables; AVN = avascular necrosis; IQR = interquartile range.