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Table 1 Frequency of video-verified impacts by game time and playing position

From: Verifying Head Impacts Recorded by a Wearable Sensor using Video Footage in Rugby League: a Preliminary Study

   Video-verified Sensor-recorded 10 g+ Sensor-recorded 10 g to < 20 g Sensor-recorded ≥ 20 g Sensor-recorded and video-verified ≥ 20 g Sensor-recorded and video-verified 10 g to < 20 g
  Playing hours (min) Game impacts (n) Impacts per game hour (n) Game impacts (n) Impacts per game hour (n) Game impacts (n) Impacts per game hour (n) Game impacts (n) Impacts per game hour (n) Game impacts (n) Impacts per game hour (n) Game impacts (n) Impacts per game hour (n)
1st half 44.6 (2673) 1545 34.6 1632 36.6 1249 28.0 383 8.6 370 8.3 768 17.2
2nd half 44.6 (2673) 1452 32.6 1540 34.5 1144 25.7 396 8.9 362 8.1 680 15.2
Forwards 35.3 (2117) 1716 48.6 1323 37.5 902 25.6 421 11.9 407 11.5 798 22.6
Backs 53.8 (3229) 1281 23.8 1849 34.4 1491 27.7 358 6.7 325 6.0 650 12.1
Total sample 89.1 (5346) 2997 33.6 3172 35.6 2393 26.9 779 8.7 732 8.2 1448 16.3