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Table 5 Adjusted relative risks of medical outcomes for no helmet vs. helmet used

From: Motorcycle helmet effectiveness in reducing head, face and brain injuries by state and helmet law

Motorcycle helmet law and type of crash Head injurya Facial injurya Traumatic brain injurya Moderate to severe head or facial injury or deathb
Partial Law, Single-Vehicle 2.1 (1.9,2.2) 2.7 (2.2,3.4) 1.8 (1.6,2.0) 1.9 (1.6,2.1)
Universal Law, Single-Vehicle 1.4 (1.2,1.6) 1.5 (1.2,1.7) 1.4 (1.2,1.6) 1.4 (1.2,1.6)
Partial Law, Multi-Vehicle 1.8 (1.6,2.0) 2.3 (1.8,2.9) 1.5 (1.3,1.8) 1.5 (1.3,1.7)
Universal Law, Multi-Vehicle 1.2 (1.1,1.4) 1.2 (1.0,1.4) 1.2 (1.0,1.4) 1.1 (1.0,1.2)
  1. Relative risks are adjusted for state, year, gender, age, intersection, night-time, and poor surface conditions using Generalized Log-Binomial regression models. 95 % Confidence Intervals are shown
  2. a Motorcycle operators with linked medical records (ED or hospital) are included
  3. b Motorcycle operators with linked medical records (ED or hospital) and those dead at the scene are included