Whiplash is the most common injury from motor vehicle collisions, and a major cause of chronic disability and pain. The progression and outcome of whiplash treatments vary, as does recovery time. Dr. John Dufton, an experienced chiropractor, is studying factors that lead to delayed recovery in patients with whiplash. Using the nationwide database of CBI Health, Dr. Dufton is comparing patients from BC, Alberta, Saskatchewan, Ontario and Quebec to determine how different types of insurance compensation and litigation systems influence patient recovery. He is also identifying physical factors and patient characteristics that place people at higher risk of developing chronic disability. The findings will provide new data on the factors that affect recovery after a whiplash injury.