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The period relative risk and cohort relative risk of maternal mortality both showed a monotonous decreasing trend. Conclusion From 1992 to 2017, the maternal mortality rate in China generally shows a downward trend, and the risk of maternal mortality has significant age, period and cohort effects.Objective To analyze the level of the knowledge and related factors of cancer prevention and treatment among residents of Beijing in 2020. Methods From April 14 to 21,a total of 11 721 residents were recruited in the study by using