Which timing category is used to describe the period after an intervention in studies?

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Timing of outcome assessment after an intervention describes when effects are measured. Right after the intervention, outcomes are described as immediate. The long-term label is used for effects that appear or persist over extended periods, usually months to years. Acute is typically used to describe a rapid onset condition or complications occurring in a short window after a procedure, rather than the standard follow-up period for general outcome assessment. Short-term sits between the immediate and long-term windows and is used for outcomes measured within days to weeks after the intervention, capturing early efficacy and safety signals. Therefore, the period after an intervention most commonly described for near-term outcomes is short-term. For example, symptom relief observed within 1–4 weeks would be considered short-term, while lasting changes beyond several months would be long-term.