Table 3.

Matched^* comparisons of San Francisco cold-water swimmers to U.S., state, and local populations: Body Mass Index (BMI)

	San Francisco Cold-water Swimmers (total group; N=103)	U.S. General Population (NHANES)	California State Population (CHIS)	San Francisco City Population (CHIS)
		Corresponding Age/Sex -matched values	Corresponding Age/Sex -matched values	Corresponding Age/Sex -matched values
BMI kg/m2 (mean (median))	25.9 (25.4)	29.2 (28.2) p<0.001	28.0 (27.2) p<0.001	26.6 (25.7) p=0.047

^*P-values are from paired t-tests using corresponding age/sex matched mean values. See text for results from non-parametric Wilcoxon signed rank tests using corresponding age/sex matched median values.