Correlations between OPRO-M short form T-scores and scores from performance-based instruments.

OPRO-M 20- and 12-item Short Form T-scores were strongly correlated with TUG times (ρ = −0.74 and −0.73, respectively), 10mWT speed (ρ = 0.77 and 0.75, respectively), and 2MWT distances (ρ = 0.83 and 0.81, respectively). Correlations between comparison self-report instrument scores and performance-based instrument scores are located in S2 Fig .