Epidemiology

One systematic review provided an estimated pooled incidence rate for CIDP of 0.33 per 100,000 person-years, and an estimated pooled prevalence rate of 2.81 per 100,000 people. There is substantial heterogeneity in incidence and prevalence across individual studies, due in part to use of different diagnostic criteria and underrecognition of CIDP variants.​[2][15][16]

CIDP can occur at any age, with most common age of onset being between 40 and 60 years.​[1][5]​​​ CIDP is more common in men, with reported male-to-female ratios of between 1.4 and 4.4.​​​​[1][2][15]​ There are no known differences between ethnic groups or geographic regions.​

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