Table 1

Number of observations for exposure and control groups across time since exposure and number of observations with missing salary information

Years until exposureExposure groupControl Δ=1Control Δ=2Control Δ=3Control Δ=4Control Δ=5
−436 80433 68131 11229 19027 85926 794
−336 97833 83431 24529 36627 97326 907
−237 19534 00331 40729 50128 14627 031
−137 44934 22431 58229 68728 28827 220
037 84834 55131 85129 92228 53027 421
137 46731 75529 83228 43327 337
236 94029 80728 42127 295
336 48428 42127 304
436 08427 314
Total observations333 249170 293188 952207 305226 071244 623
Observations with missing salary813231443529
  • Control groups have not suffered a concussion in 10+Δ years before incident; exposure group has not suffered concussion the 10 years before exposure incident.