Figure.
Relationship between the Short Physical Performance Battery (SPPB) and the 12-item W orld Health Organization Disability Assessment Schedule (WHODAS 2.0), both presented as total scores. The linear equation is given by: WHODAS 2.0 = 35.8 - 2.0 x SPPB; 95% confidence interval for SPPB = -2 .2 , -1 .8 ; R2=41.7% .