Fig. 2: Bland-Altman plot of the difference in SpO₂ nadir between the 1STST and 6MWT as a function of the mean SpO₂ nadir in the two tests.

The mean difference (solid line) and the limits of the 95% confidence interval (dotted lines) are presented. 1STST 1 min sit-to-stand test, 6MWT 6 min walk test, SpO₂ pulse oxygen saturation.