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. 2017 Dec 1;10(8):1250–1262.
B. San Francisco Cold-water Swimmers vs. California State General Population

SF Cold-water Swimmers BMI Mean CA Population BMI Mean p-value SF Cold-water Swimmers Obesity (%) CA Population Obesity (%) p-value SF Cold-water Swimmers Obesity/Overweight (%) CA Population Obesity/Overweight (%) p-value
Total 25.9 27.2 <.001 10.7 25.8 .010 53.4 61.6 .25
Men 26.4 27.6 .003 11.8 26.8 .012 59.2 68.4 .24
Women 24.6 26.8 .011 7.4 24.8 .001 37.0 55.0 .016