. Author manuscript; available in PMC: 2018 Sep 1.

Published in final edited form as: Arthritis Care Res (Hoboken). 2017 Aug 13;69(9):1360–1368. doi: 10.1002/acr.23139

Baseline Characteristics of Current Control Group Compared to Prior Control Groups with Identical Inclusion Criteria.

Characteristics	LI Group N= 78	Control Group (2012a)²¹ N=31	Control Group (2012b)²³ N=22
Sex – Men, no. (%)	34 (44)	15 (48)	12 (55)
Age (years)	64 (7)	65 (8)	64 (8)
BMI (kg/m²)	30 (5)	31 (4)	31 (5)
Stair Climbing Test (s)	16.4 (8.0)	20.2 (12.3)	19.4 (17.2)
6-minute Walk Test (m)	466 (99)	434 (99)	435 (148)
WOMAC	33 (15)	42 (14)	41 (17)
Knee Extension (°)	0 (4)	1.5 (4.0)	2 (8)
Knee Flexion (°)	126 (11)	119 (13)	119 (16)
Quadriceps Strength (Nm/kg)	1.24 (0.49)	1.32 (0.49)	1.37 (0.56)
Hamstring Strength (Nm/kg)	0.75 (0.29)	0.72 (0.26)	0.80 (0.24)
Quadriceps Activation (%)	72.3 (14.2)	75.5 (19.0)	74.6 (15.7)

All values are mean ± standard deviation except for sex which is reported in number of individuals and percent. Negative values of knee extension represent hyperextension. LI= Low-intensity group. BMI=body mass index. WOMAC=Western Ontario and McMaster Universities Osteoarthritis Index.