Skip to main content

Table 3 Percentage of variance explained by the factor solutions in Additional file 2

From: Psychometric characteristics of the chronic Otitis media questionnaire 12 (COMQ – 12): stability of factor structure and replicability shown by the Serbian version

V1 3-FAC

V2 3-FAC

V12 average 3-FAC

V12 average 4-FAC

Rotation SS Loadings

Rotation SS Loadings

Rotation SS Loadings

Rotation SS Loadings

EV

% variance

Cum %var

EV

% variance

Cum %var

EV

% variance

Cum %var

EV

% variance

Cum %var

2.818

23.484

23.484

3.152

26.267

26.267

3.008

25.065

25.065

2.626

21.884

21.884

2.466

20.550

44.033

2.436

20.297

46.563

2.520

20.998

46.064

2.167

18.060

39.943

2.282

19.021

63.054

2.055

17.126

63.689

2.182

18.186

64.249

2.083

17.362

57.305

         

1.744

14.531

71.836

  1. EV = post-rotation eigenvalues; these are typically more evenly spread in their values than before rotation, Cum %var. = cumulative percentage of the variance explained by factor scores, ie by adding the current absolute percent variance explained to the previous
  2. The first two fields show straightforward 3-factor solutions on the data from each visit separately but with scale values based on Visit 1 and 2 averaged data combined, making the scaling identical across all 4 fields although the data sources differ. In the last two fields, the item data themselves are averaged for the two visits, so both the 3- and 4-factor solutions proceed on this same averaged Visit 1 & 2 data. The main text, supported by Additional file 2 b explains why visit-averaged data and then the 3-factor solution are preferred