Calculation of the percent of patients who meet the minimally clinically important difference (MCID) thresholds for improvement in quality of life (QoL) physical component score from patient-reported outcomes assessments (VR-12, SF-12, SF-36, PROMIS Global 10 or equivalent Computer Adaptive Test (CAT) assessment, if available) following a spine surgical intervention (cervical or lumbar) Performance Rate Descriptions: Calculation of the percent of patients whose follow-up QoL Physical Component Score has a clinical improvement (improvement meets or exceeds the Minimally Clinically Important Difference (MCID) of the questionnaire in use).