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Age- adjusted mortality rates (per 10,000 woman-years) of breast cancer by cardiorespiratory fitness levels quantified in 1-MET increments obtained during a maximal treadmill test in women. Number at risk (and number of cases) in <8.0, 8.0–8.9, 9.0–9.9, and ≥10 was 3345 (34), 3805 (15), 2304 (8), and 5357 (11).
