Table 3 Chi-square test for the accuracy of predicting cup of Al-HIP method (within ± 1 size)
Influencing factors | Subgroup | Accurate | Inaccurate | n | χ2 | p |
|---|---|---|---|---|---|---|
Gender | Female | 142 (95.3%) | 7 (4.7%) | 149 | 0.000 | 1.000 |
Male | 14 (93.3%) | 1 (6.7%) | 15 | |||
Side | Right | 80 (95.2%) | 4 (4.8%) | 84 | 0.000 | 1.000 |
Left | 76 (95.0%) | 4 (5.0%) | 80 | |||
BMI | < 18.5 | 6 (100.0%) | 0 (0.0%) | 6 | 3.984 | 0.236 |
18.5–23.9 | 74 (94.9%) | 4 (5.1%) | 78 | |||
24.0–27.9 | 62 (93.9%) | 4 (6.1%) | 66 | |||
≥ 28 | 14 (100.0%) | 0 (0.0%) | 14 | |||
DDH classification | Crowe I | 23 (100.0%) | 0 (0.0%) | 23 | 6.144 | 0.060 |
Crowe II | 34 (89.5%) | 4 (10.5%) | 38 | |||
Crowe III | 52 (92.9%) | 4 (7.1%) | 56 | |||
Crowe IV | 47 (100.0%) | 0 (0.0%) | 47 |