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Table 1 Demographics and patient characteristics

From: No difference in the functional improvements between unilateral and bilateral total knee replacements

   Group 1 Group 2 p-value
   (n = 93) (n = 51)  
Gender Male 23 (24.7%) 5 (9.8%) 0.030
Female 70 (75.3%) 46 (90.2%)  
Age (years)   70.4 ± 7.2 70.0 ± 6.2 0.707
BMI (kg/m2)   27.1 ± 3.5 27.4 ± 3.4 0.615
Education (years) ≤ 6 69 (74.2%) 44 (86.3%) 0.092
>  6 24 (25.8%) 7 (13.7%)  
Income Enough 86 (92.5%) 49 (96.1%) 0.393
Lacking 7 (7.5%) 2 (3.9%)  
Current work status Without 70 (75.3%) 39 (76.5%) 0.872
With 23 (24.7%) 12 (23.5%)  
Other bone disease Without 69 (74.2%) 37 (72.5%) 0.860
With 24 (25.8%) 14 (27.5%)  
Low back pain Without 44 (47.3%) 27 (52.9%) 0.518
With 49 (52.7%) 24 (47.1%)  
CVD Without 71 (76.3%) 45 (88.2%) 0.085
With 22 (23.7%) 6 (11.8%)  
DM Without 73 (78.5%) 40 (78.4%) 0.993
With 20 (21.5%) 11 (21.6%)  
HTN Without 41 (44.1%) 16 (31.4%) 0.136
With 52 (55.9%) 35 (68.6%)  
  1. Group 1, unilateral TKR; Group 2, bilateral TKR; CVD, history of cardiovascular disease; DM, history of diabetes mellitus; HTN, history of hypertension
  2. Statistical significance was set at p < 0.0045, as described in the statistical analysis section