Long-term effects of mammography screening: updated overview of the Swedish randomised trials

Lancet
Lennarth NyströmLars Erik Rutqvist

Abstract

There has been much debate about the value of screening mammography. Here we update the overview of the Swedish randomised controlled trials on mammography screening up to and including 1996. The Kopparberg part of the Two-County trial was not available for the overview, but the continuation of the Malmö trial (MMST II) has been added. The article also contains basic data from the trials that have not been presented before. Methods The trials (n=247010, invited group 129750, control group 117260) have been followed up by record linkage to the Swedish Cancer and Cause of Death Registers. The relative risks (RR) for breast cancer death and mortality were calculated for the invited and the control groups. The trial-specific as well as the age-specific effects were analysed. RRs were calculated by the density method, with total person-time experience of the cohort by time interval of follow-up as a basis for estimating mortality rates. We calculated weighted RRs and 95% CI with the Mantel-Haenszel procedure. The median trial time-the time from randomisation until the first round was completed for the control group or if the control group was not invited, until end of follow-up-was 6.5 years (range 3.0-18.1). The median follow-up ti...Continue Reading

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