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Table 1 Patients demographics and preoperative conditions

From: Arthroscopic ankle fusion only has a limited advantage over the open operation if osseous operation type is the same: a retrospective comparative study

 Between-group difference (all patients)Difference detailed into subgroup (osseous operation type: not same)Difference detailed into subgroup (osseous operation type: same)Internal difference of OAF group (osseous operation type: not same)
AAFOAFPAAFCOOPAAFSOOPCOOSOOP
Number of patients1726 1715 1711 1511 
Mean of age (years) (95% CI)54.76 ± 14.1155.35 ± 12.520.89154.76 ± 14.1153.33 ± 14.820.78254.76 ± 14.1158.09 ± 8.350.44153.33 ± 14.8258.09 ± 8.350.310
Gender (Male/Female)10/716/100.85910/711/40.38810/77/40.79911/47/40.597
Smoker (No. and %)3 (17.6%)7 (26.9%)0.4813 (17.6%)4 (26.7%)0.5383 (17.6%)3 (27.3%)0.5444 (26.7%)3 (27.3%)0.973
Diabetes (No. and %)4 (23.5%)3 (11.5%)0.2984 (25.3%)1 (6.7%)0.1904 (23.5%)2 (18.2%)0.7361 (6.7%)2 (18.2%)0.364
Mean of BMI26.55 ± 5.2328.93 ± 5.950.18826.55 ± 5.2329.21 ± 5.220.16226.55 ± 5.2328.55 ± 7.090.40029.21 ± 5.2228.55 ± 7.090.786
Mean of AOFAS score (Preoperative)36.2 ± 13.532.5 ± 11.80.34736.2 ± 13.530.7 ± 12.80.25336.2 ± 13.534.8 ± 10.50.78030.7 ± 12.834.8 ± 10.50.395
Mean of follow-up time (months)31.94 ± 11.0734.81 ± 9.410.36831.94 ± 11.0736.53 ± 8.490.20231.94 ± 11.0732.45 ± 10.470.90436.53 ± 8.4932.45 ± 10.470.284
  1. AAF arthroscopic ankle fusion group, OAF open ankle fusion group (demographic composition: OAF=COO+SOO), COO complex osseous operation; SOO: simple osseous operation, BMI body mass index, AOFAS score the American Orthopedic Foot and Ankle Society score. P P values: α = 0.05, (Age, BMI, AOFAS score and follow-up time: independent-samples t-test; gender, smoker and diabetes: Chi-squared test)