Table 2: Changes in Knee Symptoms and Relation to Physical Activity from Baseline to Month Six. Values are Means ± SD, or % of the Group

Adults Elderly Adults
Baseline Month Six Baseline Month Six
OA pain medication (#) 1.8 ± 1.5 0.9 ± 0.8 1.1 ± 0.7 1.2 ± 0.8
Pain, walking (points) ** 8.0 ±1.3 3.0 ± 5.0 7.6 ± 1.6 5.0 ± 4.0
Pain prevents exercise (yes, %)* 78.6 33.3 78.6 41.7
Physical Activity
AX≥ 3X/week (%) 50.0 66.6 42.8 46.2
Session duration level^ 1.3 ± 1.5 2.3 ± 1.4 1.4 ± 1.6 1.8 ± 1.5

Note: pain was assessed using a 0-10 Numerical pain rating scale. AX = aerobic exercise.
^ Session duration: 1= 10-15 min, 2: 15-30 min, 3: 30-45 min, 4: 45min-1 hr and 5: ≥1 hour.
* The interaction of group by time, p<0.05;
** significant by time, p<0.05.