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Table 5 Classification of adverse event severity

From: A mixed-methods feasibility study of a comorbidity-adapted exercise program for low back pain in older adults (COMEBACK): a protocol

Mild: asymptomatic or mild symptom, requiring self-care only (e.g. ice/heat, over-the-counter analgesic)
Moderate: limiting age-appropriate activities of daily living (e.g. work, school) OR sought care from a medical doctor
Serious: results in death OR is a life-threatening AE OR an AE resulting in inpatient hospitalization or prolongation of existing hospitalization for more than 24 h, a persistent or significant incapacity or substantial disruption of the ability to conduct normal life functions, a congenital anomaly/birth defect