What are the key injury criteria measured in crash testing?

Key injury criteria include: HIC (Head Injury Criterion) - weighted head acceleration over 15 or 36ms window; Nij (neck injury) - combination of axial force and bending moment; CTI (Combined Thorax Index) - chest deflection and spinal acceleration; Femur load - axial force on femur; Tibia Index - combined axial and bending loads; and abdomen force. Each has threshold values based on biomechanical research. Different dummies measure different body regions appropriately for their position. Regulatory requirements and NCAP ratings are based on injury criteria performance.