Fig. 2. Fat-free mass index (FFMI) as a function of fat mass index (FMI) in women (broken lines, N=61) and men (continuous lines, N=112). The regression lines with 95% confidence limits are calculated for the subjects with the physical activity levels presented in Fig.1 (women, r²=0.61, P<0.0001; men, r²=0.44, P<0.0001). Data for elite athletes, four women (filled symbols) and four men (open symbols) from the Swedish national cross-country ski team (Sjödin et al., 1994) are plotted in the same figure.