TABLE I.

Baseline Variables

	Total Knee Arthroplasty Group			Control Group
Variable*	Mean and Standard Deviation	Median	Range	Mean and Standard Deviation	Median	Range
Age (yr)	65.77 ± 8.94	65.5	50 to 84	63.06 ± 8.45	63	50 to 82
Height (m)	1.71 ± 0.10	1.72	1.47 to 1.88	1.71 ± 0.10	1.7	1.47 to 1.91
Weight (kg)	90.74 ± 17.6	90.47	47.62 to 162.81	78.4 ± 15.0	78.12	44.67 to 113.83
BMI (kg/m2)	30.9 ± 5.2	30.18	21.79 to 53.78	26.79 ± 4.2	26.29	18.61 to 38.37
KOS-ADLS score (%)	50.38 ± 16.66	50	8.57 to 88.6	98.04 ± 3.8	100	85.7 to 100
Quadriceps strength (N/BMI)
Operative side	19.28 ± 7.30	19.3	3.40 to 40.86
Nonoperative side	23.50 ± 8.75	23.24	1.83 to 51.40	28.95 ± 9.47	28.74	5.55 to 56.7
Active knee range of motion (deg)
Extension	4 ± 5	3	−4 to 25	−1 ± 3	−1	−10 to 6
Flexion	119 ± 14	122	64 to 142	138 ± 7	138	121 to 155

^*BMI = body mass index, and KOS-ADLS = Knee Outcome Survey Activities of Daily Living Scale.