Table 2 . Knee injury and osteoarthritis outcome scores (KOOS) over time in the two study groups .
| Variables | Time of study | p * | ||
| Baseline | Week 4 | Week 8 | ||
| Pain | 0.59 | |||
| TENS group | 41.3 (3.43) | 46.7 (3.14) £ | 44.2 (3.88) | |
| PRP group | 44.9 (3.56) | 54.4 (4.15) £ | 50.7 (3.24) | |
| Symptoms | 0.047 | |||
| TENS group | 50.3 (3.87) | 51.7 (3.56) | 52.0 (3.96) | |
| PRP group | 51.5 (4.47) | 63.6 (4.23) £ | 61.5 (3.86)* | |
| ADL | 0.44 | |||
| TENS group | 42.4 (4.09) | 46.9 (3.68) | 44.2 (4.36) | |
| PRP group | 48.3 (3.81) | 58.7 (4.08) £ | 54.4 (3.35) | |
| Sport/Rec | 0.99 | |||
| TENS group | 28.4 (6.16) | 27.6 (6.11) | 25.4 (5.31) | |
| PRP group | 23.8 (4.87) | 22.9 (4.68) | 21.3 (4.33) | |
| QOL | 0.12 | |||
| TENS group | 20.6 (3.65) | 18.4 (2.68) | 17.6 (2.58) | |
| PRP group | 17.1 (2.62) | 23.0 (3.14) | 22.6 (2.49) | |
* The P-value for Group×Time interaction (Based on the results of GEE analysis)
The values are expressed as mean (SD).
Note: TENS group: exercise therapy with TENS modality group. KOOS consists of five subscales; pain, other symptoms, function in sport and recreation (Sport/Rec) and knee related quality of life (QOL). A normalized score (range 0 to 100 with 0 indicating extreme problems and 100 indicating no problem) is calculated for each subscale.
£ p<0.05 for statistical difference from baseline to week 4 within the group.