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Impact of variable look‐back periods on the incidence rates of chronic diseases using real world data

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Estimating disease incidence based on secondary data requires a look‐back period to exclude patients with pre‐existing disease from the incidence risk set. However, the optimal length of the look‐back period… Click to show full abstract

Estimating disease incidence based on secondary data requires a look‐back period to exclude patients with pre‐existing disease from the incidence risk set. However, the optimal length of the look‐back period and its impact on incidence rates are often unknown. We studied the impact of the length of the look‐back period on incidence rates of 24 different chronic diseases.

Keywords: incidence; chronic diseases; look back; impact; incidence rates

Journal Title: Pharmacoepidemiology and Drug Safety
Year Published: 2020

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