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Table 1 Demographics and comorbidity profile of the patients

From: The influence of previous arthroscopic treatment on subsequent primary total knee arthroplasty: the comparison between bilateral knees of the same patient

  Experimental group Control group P
Age (years) 62.89 ± 6.30 (46–73) 63.06 ± 6.27 (47–74) 0.160
Gender (male/female) 7/49 7/49
BMI (kg/m2) 27.96 ± 2.97 (21.48–35.54) 27.79 ± 3.01 (22.03–35.54) 0.541
ASA    0.813
 1 1 1  
 2 29 28  
 3 26 27  
Anesthesia    0.810
 General anesthesia 31 32  
 Non-general anesthesia 25 24  
Comorbidity
 Hypertension 22 22 1.000
 Coronary heart disease 8 8 1.000
 Diabetes 14 14 1.000
 Cerebral infarction 1 1 1.000
 Respiratory system 6 6 1.000
 Digestive system 2 2 1.000
 Urinary system 1 1 1.000
K-L grading
 III 18 25 0.174
 IV 38 31 0.174