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. 2005 Sep 13;93(7):817–824. doi: 10.1038/sj.bjc.6602758

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Copyright © 2005 Cancer Research UK

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Relative risk for premenopausal breast cancer in women who reported participating in sports more than one compared to 1 h or less per week at ages 12–30 years, by different characteristics. Black squares indicate relative risks (RRs), area of which is proportional to the amount of information contributed (i.e., to the inverse of the variance of the logarithm of the RRs). Lines indicate 95% confidence intervals (CIs).