NNIPPS-PPS scores at entry by diagnosis - Internal consistency and inter-rater reliability.

Means ± standard deviation (SD) of the NNIPPS-PPS dimensional and total scores at entry according to diagnosis: Progressive Supranuclear Palsy (PSP), Multiple System Atrophy (MSA). All within groups comparisons (mean versus 0) are statistically significant (p<0.001 by Student's t test). Comparisons between diagnostic groups (Student's t test): ap<0.05, bp<0.01, cp<0.001, dp<0.0001. Columns: Dimension labels (dimension ranges of scores- from 0 = normal, to maximum severity). Internal consistency is expressed as Cronbach's α coefficient, with threshold for acceptability set at α = 0.70. Agreement coefficients (Intra-Class Coefficients-ICC) from the inter-rater reliability study ranged from 0.54 (moderate) to 0.94 (excellent). ADL = Activities of Daily Living.