The average NDI change score for neck pain/injury patients treated during the observation period will be reported. Additionally, a risk-adjusted NDI change difference score will be calculated by subtracting the predicted NDI change score from the average NDI change score for each patient, then average the adjusted scores for each physical therapist or physical therapy group. The risk adjustment will be calculated using generalized linear modelling adjusting for: baseline NDI score, baseline pain score, age, sex, smoking, comorbidities, payer, and symptom duration (time from surgery or injury to baseline physical therapy visit). These measures will serve as a physical or occupational therapy performance measure at the eligible physical or occupational therapist or physical or occupational therapy group level. Rate 1: Average NDI Change Score, Rate 2: Risk-adjusted Average NDI Change Score.