Table 6 Summary of the sample size adequacy measures and exploratory factor analysis of the Pittsburgh Sleep Quality Index in community dwelling Ethiopian adults

Kaiser-Meyer-Olkin Test of Sampling Adequacy

0.51

0.52

Bartlett’s test of Sphericity

<0.001

<0.001

Anti-image matrix

0.39–0.67

0.48–0.64

Determinant

0.08

0.09

 Kaiser’s criteria (Eigenvalue > 1)

3

2

 Cumulative variance rule (>40%)

2

1

 Scree plot

3

2

 Parallel analysis

3

2