Table 1

The match injury incidence (injuries per 1000 player-match-hours) of concussion in the first and last seasons of the injury surveillance period, and the proportionality constant from a weighted least squares fit of the incidences from all seasons

Data setIncidence 2012–2013Incidence 2015–2016Weighted least squares proportionality constant
Club rugby7.1 (4.3, 11.0)21.4 (16.0, 28.0)4.94 (1.69, 8.19)
International rugby18.2 (5.0, 46.6)22.2 (9.6, 43.8)1.99 (−12.69, 16.67)
Combined club and international rugby7.9 (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.