The study aimed to establish the Fragility Index for hamstring injury risk factors, which indicates how many participants would need to change risk classification for a statistically significant risk factor to become nonsignificant.
Researchers conducted a retrospective analysis of 78 articles focused on hamstring injury risk factors, creating 2 × 2 contingency tables to analyze relative risk and confidence intervals.
Findings showed that the median Fragility Index for both modifiable and nonmodifiable risk factors was 3, with over 35% of these factors having a Fragility Index of 2 or less, highlighting that many significant associations are fragile and should be interpreted with caution.