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Table 4 Multivariable analysis results for the association between more than 130 degrees of knee flexion and patients’ satisfaction after TKA

From: A high degree of knee flexion after TKA promotes the ability to perform high-flexion activities and patient satisfaction in Asian population

Variable   Univariable   Multivariable   Multivariable  
  OR (95% CI) p-value OR (95% CI) p-value OR (95% CI) p-value
Knee flexion after TKA (°)   1.02 (1.01–1.03) 0.001 1.008 (0.997–1.019) n.s.   
≥130° of Knee flexion after TKA (°)
 No   1 (Reference)     1 (Reference)  
 Yes   1.82 (1.34–2.47) < 0.001    1.38 (1.007–1.889) 0.045
Ability to do high-flexion activities
 Kneel (reference: impossible) Hard to do 0.78 (0.57–1.06) n.s.     
Easy to do 1.07 (0.61–1.88) n.s.     
 Squat (reference: impossible) Hard to do 0.76 (0.55–1.03) n.s.     
Easy to do 0.95 (0.55–1.65) n.s.     
 Sit cross-legged (reference: impossible) Hard to do 1.71 (1.23–2.39) 0.001 1.426 (1.015–2.003) 0.041 1.414 (1.008–1.985) 0.045
Easy to do 3.89 (2.58–5.87) < 0.001 2.557 (1.64–3.988) < 0.001 2.458 (1.573–3.842) < 0.001
 Stand from the floor (reference: impossible) Hard to do 3.89 (1.81–8.34) < 0.001 3.104 (1.403–6.87) 0.005 3.107 (1.405–6.867) 0.005
Easy to do 8.15 (3.63–18.28) < 0.001 4.429 (1.886–10.4) 0.001 4.45 (1.897–10.438) 0.001
Age (years) (reference: <  60) 60–74 0.86 (0.5–1.48) n.s.     
≥ 75 0.69 (0.36–1.31) n.s.     
Male (vs. female)   2.51 (1.32–4.8) 0.005 2.282 (1.217–4.278) 0.01 2.312 (1.234–4.331) 0.009
Body mass index (kg/m2) (reference: <  25) 25 - < 30 1.27 (0.88–1.84) n.s.     
≥ 30 1.07 (0.66–1.73) n.s.     
Bilateral TKA (vs. unilateral TKA)   1.41 (1.01–1.98) 0.046 1.443 (1.035–2.013) 0.031 1.456 (1.045–2.028) 0.026
Patellar resurfacing (vs. un-resurfacing)   0.68 (0.45–1.04) n.s.     
  1. OR odds ratio, CI confidence interval, n.s. not significant