A denominator combining number of people and duration observed, used to express incidence rates.
Person-time sums each individual's observed time at risk to form the denominator for an incidence rate, allowing comparison across cohorts followed for different durations. Rates expressed per 1000 person-weeks assume roughly constant risk over the observation period, an assumption that may not hold across differing training phases or surveillance intensity between pooled studies.
This guide was auto-drafted and is pending editorial review.