Data set | Incidence 2012–2013 | Incidence 2015–2016 | Weighted least squares proportionality constant |
Club rugby | 7.1 (4.3, 11.0) | 21.4 (16.0, 28.0) | 4.94 (1.69, 8.19) |
International rugby | 18.2 (5.0, 46.6) | 22.2 (9.6, 43.8) | 1.99 (−12.69, 16.67) |
Combined club and international rugby | 7.9 (5.1, 11.7) | 21.5 (16.4, 27.6) | 4.68 (0.81, 8.55) |
Rows in bold indicate where the proportionality constant significantly differs from zero.