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Demographic and clinical features of the 58 patients
| version (+) | version (−) | Intergroup statistics | |
|---|---|---|---|
| Sex (M/F) | 13/8 | 14/23 | X 2 = 3.119 p = .077 |
| Side (L/R) | 11/10 | 23/14 | X 2 = 0.528 p = .467 |
| Frequency (n/month median) | 4 | 5 | Z = −1.311 p = .190 |
| Onset age (years) | 10.72 ± 6.54 | 15.32 ± 7.06 | t = −2.448 p = .018 |
| Surgery age (years) | 25.33 ± 6.74 | 26.44 ± 7.34 | t = −0.620 p = .538 |
| Duration (years) | 14.61 ± 7.90 | 11.22 ± 7.45 | t = 1.631 p = .109 |
