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Table 1 Summary of patient data

From: Identifying factors predicting prolonged rehabilitation after simultaneous bilateral total knee arthroplasty: a retrospective observational study

All patients (n = 191) Compliance group (n = 132) Delayed group (n = 59) P-value
Age, years
  < 60 4 1  
 60–70 26 6  
 70–80 76 25  
 80–90 26 27  
 Average 74.2 77.9 < 0.001a
Female, % 83.3% 88.1% 0.393b
Body mass index, kg/m2
  < 20 3 0  
 20–25 38 20  
 25–30 66 22  
 30–35 22 13  
  > 35 3 4  
 Average 27.1 27.7 0.706 c
Living alone, % 15.9% 27.1% 0.077b
Knee Society score
 Walking 24.5 22.7 0.138 c
 Stairs 27.1 23.2 0.061 c
 Walking aids used 3.5 5.0 0.043 c
 Total 48.1 41.6 0.057 c
ASA class
 I 11 2  
 II 119 51  
 III 2 6  
 Average 1.93 2.07 0.009 c
Hemoglobin, g/dL 13.1 12.6 0.014a
Albumin, g/dL 4.4 4.3 0.018a
Mean range of motion
 Extension 12.7 12.3 0.704 c
 Flexion 113.4 114.5 0.964 c
Mean K–L grade 3.86 3.89 0.753 c
Length of stay (days, excluding transferred cases) 18.5 23.6 < 0.001 c
Transferred cases, number 0 13  
  1. Values are presented as mean. P-values were obtained using the Mann–Whitney U test or chi-square test
  2. n number, ASA American society of anesthesiologists, K–L grade Kellgren–Lawrence classification
  3. aNon-paired t-test
  4. bchi-square test
  5. cMann–Whitney U test