. Author manuscript; available in PMC: 2020 Jun 1.

Published in final edited form as: Osteoarthritis Cartilage. 2019 Feb 28;27(6):885–894. doi: 10.1016/j.joca.2019.02.795

Table 1.

Baseline characteristics of the baseline-to-2-year cartilage damage worsening analysis sample (n = 275 knees from 164 persons)

Person-based characteristics (n = 164):	Mean (SD) or number (%)
Age (years)	63.7 (9.8)
Female	130 (79.3%)
BMI (kg/m²)	28.0 (5.3)
WOMAC pain (0–20), higher indicating more severe pain	4.5 (3.5)
WOMAC function (0–68), higher indicating worse function	12.9 (11.1)
Knee-based characteristics (n = 275):
K/L grade
0	16 (5.8%)
1	72 (26.2%)
2	143 (52.0%)
3	44 (16.0%)
PF joint space narrowing score
0	101 (36.7%)
1	103 (37.5%)
2	71 (25.8%)
Hip abductor strength (Nm/kg)	0.84 (0.24)
Knee extensor strength (Nm/kg)	1.01 (0.29)

Abbreviations: SD, Standard Deviation; BMI, Body Mass Index; WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index; K/L, Kellgren/Lawrence; PF, patellofemoral