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Table 1
Baseline characteristics of the cohorts, month, M (Q1; Q3).
| Parameter | PFO group | Non-PFO group | χ2/Z value | P-value |
|---|---|---|---|---|
| No. of cases (hips) | 28 (31) | 24 (28) | – | – |
| Sex (male/female) | 2/26 | 5/19 | 1.070 | 0.301 |
| Affected side (left/right/bilateral) | 11/14/3 | 10/10/4 | 0.553 | 0.759 |
| Tönnis types (I/II/III) | 0/29/2 | 1/26/1 | 1.737 | 0.420 |
| Follow-up time (month) | 43.0 (35.0, 53.0) | 37.0 (29.0, 46.0) | −1.899* | 0.058 |
| Operative age (month) | 19.0 (17.0, 25.0) | 16.0 (16.0, 23.5) | −1.691* | 0.091 |
Note: sex, affected side, and Tönnis types were compared using the χ2 test; follow-up time and operative age were compared using the Mann–Whitney U test; *: Z value.
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