Disparities in the increases of cervical cancer incidence rates: observations from a city-wide population-based study.

However, an unfavorable trend has been observed in China during the past decades, and the underlying reasons remain unclear.

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The incidence showed a downward trend in the age groups of 20–49 years, and an increasing trend in the age groups of 50–74 years, which were consistent with the increasing risk in successive birth-cohorts born between 1922 and 1966s and decreasing risk after 1966s [ 27 ].

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