Re: Promoting Regular Mammography Screening I. A Systematic Assessment of Validity in a Randomized Trial | Zendy

Jim McCambridge | Zendy; Kypros Kypri | Zendy; John Attia | Zendy; Diana Elbourne | Zendy

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Re: Promoting Regular Mammography Screening I. A Systematic Assessment of Validity in a Randomized Trial

Author(s) -

Jim McCambridge,

Kypros Kypri,

John Attia,

Diana Elbourne

Publication year - 2009

Publication title -

jnci journal of the national cancer institute

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.797

H-Index - 356

eISSN - 1460-2105

pISSN - 0027-8874

DOI - 10.1093/jnci/djp154

Subject(s) - randomized controlled trial , mammography , medical physics , medicine , systematic review , mammography screening , medline , breast cancer , political science , cancer , law

We congratulate del Junco et al. for undertaking a dedicated study of validity in their mammography screening trial. We are particularly interested in their randomized studies of the possible effects of completing baseline surveys and in their conceptualization of validity. The study population was randomly sampled, and screening rates in the assessed control group were compared with secular trends among nonparticipants, providing a robust test of whether study participation altered screening behavior, and thus whether the findings have external validity

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