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

SF Cold-water Swimmers BMI Mean SF Population BMI Mean p-value SF Cold-water Swimmers Obesity (%) SF Population Obesity (%) p-value SF Cold-water Swimmers Obesity/Overweight (%) SF Population Obesity/Overweight (%) p-value
Total 25.9 25.0 .01 10.7 11.8 1.0 53.4 43.6 .26
Men 26.4 25.5 .017 11.8 11.7 1.0 59.2 48.5 .20
Women 24.6 24.5 .91 7.4 12.0 .34 37.0 37.7 1.0