Strength of evidence for relationship between associated factors and patellar tendinopathy
| Risk factor | No of high and low-score studies | No of studies with positive effect | Level of evidence |
|---|---|---|---|
| Demographics | |||
| Age | High: 1 | High: 0 | Inconclusive |
| Low: 4 | Low: 0 | ||
| Gender | High: 0 | High: 0 | Inconclusive |
| Low: 2 | Low: 0 | ||
| Anthropometrics | |||
| Height | High: 2 | High: 0 | Inconclusive |
| Low: 4 | Low: 0 | ||
| Weight | High: 2 | High: 1 | Some |
| Low: 6 | Low: 2 | ||
| Body mass index/weight–height ratio | High: 1 | High: 1 | Some |
| Low: 2 | Low: 1 | ||
| Waist and hip girth | High: 1 | High: 1 | Inconclusive |
| Low: 1 | Low: 0 | ||
| Waist-to-hip ratio | High: 1 | High: 1 | Some |
| Low: 1 | Low: 1 | ||
| Leg-length difference | High: 1 | High: 0 | Some |
| Low: 2 | Low: 2 | ||
| Longer tibial length to stature | High: 0 | High: 0 | Inconclusive |
| Low: 1 | Low: 1 | ||
| Arch height of foot | High: 0 | High: 0 | Some |
| Low: 1 | Low: 1 | ||
| Sports-related factors | |||
| Playing years | High: 0 | High: 0 | Inconclusive |
| Low: 2 | Low: 0 | ||
| Amount of training/competition | High: 0 | High: 0 | Inconclusive |
| Low: 6 | Low: 3 | ||
| Strength training | High: 0 | High: 0 | Inconclusive |
| Low: 3 | Low: 1 | ||
| Jump training | High: 0 | High: 0 | Inconclusive |
| Low: 2 | Low: 0 | ||
| Playing surface volleyball | High: 0 | High: 0 | Inconclusive |
| Low: 1 | Low: 1 | ||
| Strength/flexibility | |||
| Quadriceps flexibility | High: 1 | High: 1 | Some |
| Low: 0 | Low: 0 | ||
| Hamstring flexibility | High: 1 | High: 1 | Some |
| Low: 1 | Low: 0 | ||
| Sit and reach scores | High: 0 | High: 0 | Inconclusive |
| Low: 4 | Low: 1 | ||
| Angle dorsiflexion range | High: 0 | High: 0 | Inconclusive |
| Low: 2 | Low: 1 | ||
| Quadriceps strength | High: 1 | High: 0 | Some |
| Low: 4 | Low: 1 | ||
| Hamstring strength | High: 1 | High: 0 | Inconclusive |
| Low: 1 | Low: 0 | ||
| Vertical jump performance | High: 0 | High: 0 | Some |
| Low: 5 | Low: 3 | ||