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Table 3 Mean values and time by treatment interaction results of secondary outcome measures*

From: A treatment applying a biomechanical device to the feet of patients with knee osteoarthritis results in reduced pain and improved function: a prospective controlled study

Outcome Baseline Follow-up
(4 weeks)
Final
(8 weeks)
P Value†
SF-36 Physical Functioning subscale
   Active 46.0 ± 18.6 61.8 ± 19.2 69.2 ± 21.0 P < 0.001
   Control 43.7 ± 21.1 36.7 ± 20.9 38.7 ± 22.1  
   P Value 0.66 <0.001 <0.001  
SF-36 Mental Health subscale
   Active 57.5 ± 45.3 73.6 ± 38.2 90.8 ± 23.4 0.004
   Control 56.0 ± 39.3 42.7 ± 40.3 44.0 ± 39.3  
   P value 0.90 0.006 <0.001  
SF-36 Score Results
   Active 56.0 ± 21.1 68.1 ± 17.7 77.1 ± 15.1 <0.001
   Control 53.5 ± 18.9 51.1 ± 19.5 48.5 ± 22.1  
   P value 0.65 0.001 <0.001  
Knee Society Score
Knee Score
   Active 54.1 ± 17.9 67.0 ± 14.3 78.6 ± 11.6 <0.001
   Control 60.3 ± 17.9 62.1 ± 17.8 50.8 ± 17.8  
   P value 0.44 0.25 <0.001  
Knee Function Score
   Active 52.6 ± 17.6 61.8 ± 16.8 71 ± 16.8 <0.001
   Control 56.0 ± 14.8 56.4 ± 17.0 51.4 ± 16.9  
   P value 0.20 0.23 <0.001  
  1. * Secondary outcome measures: SF-36 Health Survey (0-100 scale) and knee society score (0-100 scale). Mean values are presented as mean ± SD.
  2. The vertical p-value represent the time by treatment interaction results. This represents the difference between the groups at different points in time. The horizontal p-value represents group differences in the three examination points. This represents the differences in the active group across the three follow-ups. No significant differences were found in the control group.