The ‘drift’ parameter of Clayton and Schifflers (1987a) , a trend in incidence which could be interpreted as either a period or cohort effect, was highly significant, a 19% increase in incidence per 5-year period or birth cohort (RR=1.19, 95%CI 1.17–1.20).
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Incidence trends of prostate cancer in East Anglia, before and during the era of PSA diagnostic testing.
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