The study: https://journals.humankinetics.com/view/journals/pes/38/3/article-p268.xml https://journals.humankinetics.com/view/journals/pes/38/3/ar... From an

The study: https://journals.humankinetics.com/view/journals/pes/38/3/article-p268.xml https://journals.humankinetics.com/view/journals/pes/38/3/ar... From an initial glance, it looks like the results are all based on self-reporting and that over an eight year period there were three reports: at the start, at the two year mark, and at the eight year mark.