The myasthenia gravis--specific activities of daily living profile.

The myasthenia gravis activities of daily living (MG-ADL) profile is an eight-item patient-reported scale developed to assess MG symptoms and their effects on daily activities. The MG-ADL profile correlated well with the Quantitative MG (QMG) score (r= 0.58, P < 0.001) in 254 consecutive patient visits. Further analysis during clinical trials confirmed the excellent correlation with the QMG test and provided additional evidence that the MG-ADL profile is responsive to clinical improvement. MG-ADL performance was further analyzed during a recent multicenter, prospective scale validation study for two new outcome measures. At the first visit, there was a strong positive correlation between the MG-ADL and the MG Composite (r= 0.85, P < 0.0001) and between the MG-ADL and the MG-Quality of life15 (MG-QOL15) (r= 0.76, P < 0.0001). Test-retest analysis demonstrated a high reliability coefficient. Sensitivity/specificity analysis revealed that a 2-point improvement has the best trade-off attributes to predict clinical improvement. The MG-ADL profile also performed well on Rasch analysis. The MG-ADL scoring system is useful as a secondary outcome measure and in routine clinical management.