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Table 4 Comparison of pre- and postoperative HHS

From: Impingement-free hip range of motion after osteochondroplasty and relative neck lengthening in adults with healed Perthes disease

HHS Paired t test
  Range Mean ± SD Improvement mean ± SD P value (significance)
Preoperative 60–73 66.5 ± 3.9 22.9 ± 8.6 < 0.0001 (ES)
Postoperative 65–100 89.4 ± 11.8
  1. SD Standard deviation, ES Extremely significant