Improving predictor selection for injury modelling methods in male footballers

Philp, Fraser; Al-shallawi, Ahmad; Kyriacou, Theocharis; Blana, Dimitra; Pandyan, Anand

Abstract

Objectives
This objective of this study was to evaluate whether combining existing methods of elastic net for zero-inflated Poisson and zero-inflated Poisson regression methods could improve real-life applicability of injury prediction models in football.

Methods
Predictor selection and model development was conducted on a pre-existing dataset of 24 male participants from a single English football team's 2015/2016 season.

Results
The elastic net for zero-inflated Poisson penalty method was successful in shrinking the total number of predictors in the presence of high levels of multicollinearity. It was additionally identified that easily measurable data, that is, mass and body fat content, training type, duration and surface, fitness levels, normalised period of 'no-play' and time in competition could contribute to the probability of acquiring a time-loss injury. Furthermore, prolonged series of match-play and increased in-season injury reduced the probability of not sustaining an injury.

Conclusion
For predictor selection, the elastic net for zero-inflated Poisson penalised method in combination with the use of ZIP regression modelling for predicting time-loss injuries have been identified appropriate methods for improving real-life applicability of injury prediction models. These methods are more appropriate for datasets subject to multicollinearity, smaller sample sizes and zero-inflation known to affect the performance of traditional statistical methods. Further validation work is now required.

Citation

Philp, F., Al-shallawi, A., Kyriacou, T., Blana, D., & Pandyan, A. (2020). Improving predictor selection for injury modelling methods in male footballers. BMJ Open Sport & Exercise Medicine, 6(1), e000634 - e000634. https://doi.org/10.1136/bmjsem-2019-000634

• Journal Article Type: Article
• Acceptance Date: Dec 15, 2019
• Publication Date: Jan 14, 2020
• Journal: BMJ Open Sport and Exercise Medicine
• Print ISSN: 2055-7647
• Publisher: BMJ Publishing Group
• Peer Reviewed: Peer Reviewed
• Volume: 6
• Issue: 1
• Pages: e000634 - e000634
• DOI: https://doi.org/10.1136/bmjsem-2019-000634
• Keywords: football, footballers, injury, predictor
• Publisher URL: https://bmjopensem.bmj.com/content/6/1/e000634