Relative risk (RR) of false positive recall in relation to hormone replacement therapy (HRT) use, in various subgroups of women

Copyright information:Taken from "Hormone replacement therapy and false positive recall in the Million Women Study: patterns of use, hormonal constituents and consistency of effect"Breast Cancer Research 2005;8(1):R8-R8.Published online 23 Dec 2005PMCID:PMC1413983.Copyright © 2005 Banks et al.; licensee BioMed Central Ltd. *Relative to never-users, stratified by screening centre, age at screening, previous screening, body mass index, previous breast operation and time since menopause (where appropriate). Relative risks are shown as black squares with areas inversely proportional to the variance of the log relative risk, indicating the amount of statistical information available for that particular estimate. The corresponding confidence intervals (CI) are shown as horizontal lines. An arrow is used where the upper confidence limit exceeds the scale of the figure.