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Table 1 CFA fit statistics for the two versions of the PPM-O

From: Exploring the construct validity of the Patient Perception Measure – Osteopathy (PPM-O) using classical test theory and Rasch analysis

Statistic

Recommended value

22-item PPM-O

13-item PPM-O

χ2

NA

357.23

130.46

χ2 p-value

<0.05

>0.0001

>0.0001

df

NA

194

64

χ2/df

< or = 2

1.84

2.04

Goodness of fit index (GFI)

> or = 0.9

0.828

0.879

Comparative fit index (CFI)

> or = 0.9

0.841

0.855

Normed fit index (NFI)

> or = 0.9

0.717

0.757

Tucker-Lewis index (TLI)

> or = 0.9

0.811

0.824

Root mean square residual (RMR)

As close to 0 as possible

0.048

0.054

Root mean square error of approximation (RMSEA)

< or = 0.08

0.075 (CI 0.062-0.087)

0.083 (CI 0.062-0.103)