Scoring the test (PFITs) An ordinal score is obtained out of 12 (ie. adding scores out of 3 for the 4 items) as per table 1. PFIT Score 0 1 2 3 Total Assistance Unable Assist Assist No x2 x1 assist Cadence Unable >0 - 49 50 -<80 80+ (steps/min) Shoulder (grade) 0,1 or 2 3 4 5 Knee (grade) 0,1 or 2 3 4 5 Table 1. PFIT scoring The PFITs (interval score) is then obtained from the Rasch analysis algorithm (see table 2). The conversion to an interval scoring scale is required in order for parametric statistics to be used in data analyses. Ordinal 0 1 2 3 4 5 6 7 8 9 10 11 12 score /12 Interval 0 2.0 3.2 3.9 4.4 4.9 5.4 5.9 6.4 7.1 7.9 8.8 10 PFIT score /10 Table 2. PFIT ordinal and interval scale scoring.
Scoring the test (PFITs) An ordinal score is obtained out of 12 (ie. adding scores out of 3 for the 4 items) as per table 1. PFIT Score 0 1 2 3 Total Assistance Unable Assist x2 Assist x1 No assist Cadence (steps/min) Unable >0 - 49 50 -<80 80+ Shoulder (grade) 0,1 or 2 3 4 5 Knee (grade) 0,1 or 2 3 4 5 Table 1. PFIT scoring The PFITs (interval score) is then obtained from the Rasch analysis algorithm (see table 2). The conversion to an interval scoring scale is required in order for parametric statistics to be used in data analyses. Ordinal score /12 0 1 2 3 4 5 6 7 8 9 10 11 12 Interval PFIT score /10 0 2.0 3.2 3.9 4.4 4.9 5.4 5.9 6.4 7.1 7.9 8.8 10 Table 2. PFIT ordinal and interval scale scoring.
PFIT-instructions-2013.docx