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. 2017 Dec 1;10(8):1250–1262.
A. San Francisco Cold-water Swimmers vs. U.S. General Population

SF Cold-water Swimmers BMI Mean U.S. Population BMI Mean p-value SF Cold-water Swimmers Obesity (%) U.S. Population Obesity (%) p-value SF Cold-water Swimmers Obesity/Overweight (%) U.S. Population Obesity/Overweight (%) p-value
Total 25.9 28.7 <.001 10.7 35.7 <.001 53.4 68.8 .029
Men 26.4 28.7 <.001 11.8 35.5 <.001 59.2 73.9 .036
Women 24.6 28.7 <.001 7.4 35.8 <.001 37.0 63.7 <.001