Table 4

The three factor solution of the principal component analysis

Factor 3.1:

Factor 3.2:

Factor 3.3:

Item

Abbreviated item description

Item mean (SD)

Effect of dizziness and unsteadiness on emotion and participation

Specific activities/movements or effort provoking dizziness or unsteadiness

self-perceived

walking ability and feeling of postural stability in relation to contextual factors


load

CI-TC

load

CI-TC

load

CI-TC

E 23

feeling depressed

1.8 (1.5)

0.792

0.68

E 2

feeling frustrated

2.4 (1.4)

0.757

0.59

E 21

feeling handicapped

2.3 (1.5)

0.653

0.76

F 24

job/house responsibilities

2.0 (1.6)

0.652

0.71

E 10

embarrassed in front of others

1.6 (1.9)

0.622

0.38

F 6

restriction of social activities

2.1 (1.7)

0.567

0.74

E 22

stressed relationships

1.3 (1.6)

0.563

0.65

F 3

restriction of travel

2.2 (1.7)

0.463

0.65

E 18

difficulties in concentrating

1.9 (1.5)

0.397

0.49

Cronbachs alpha

0.88

P 13

turning over in bed

1.7 (1.6)

0.747

0.52

P 11

quick head movements

2.9 (1.5)

0.726

0.55

P 1

looking up

2.3 (1.6)

0.707

0.48

F 5

getting into or out of bed

1.6 (1.6)

0.683

0.56

P 25

bending over

2.0 (1.7)

0.618

0.48

P 8

ambitious activities like sports

2.3 (1.7)

0.439

0.56

F 14

strenuous housework

2.1 (1.6)

0.410

0.60

F 7

difficulties in reading

1.5 (1.6)

0.200

0.253

0.35

0.209

Cronbachs alpha

0.80

P 17

walking down a sidewalk

1.1 (1.5)

0.713

0.58

F 19

walking around in dark

1.7 (1.7)

0.701

0.42

F 16

walking by yourself

1.2 (1.5)

0.623

0.61

E 15

afraid of appearing intoxicated

1.4 (1.7)

0.580

0.51

E 9

afraid of leaving home alone

1.0 (1.3)

0.572

0.58

P 4

walking down a supermarket aisle

1.8 (1.7)

0.553

0.51

F 12

avoid heights

2.3 (1.8)

0.543

0.43

E 20

afraid to stay home alone

0.5 (1.1)

0.416

0.44

Cronbachs alpha

0.79


The table indicates item statistics, factor loadings, corrected item-total correlations (CI-TC) and Cronbachs alpha correlation coefficients estimated in n = 194. Values of factor loadings are results of the pattern matrix. Bold face indicates loadings with absolute values of 0.6 or more. Loadings < 0.4 are not reported with exception of the values of F7, which has only low loadings. The 3-factor solution explained 49.2% of the variance.

Abbreviations: E indicates emotional subscale; F, functional subscale; P, physical subscale of the Dizziness Handicap Inventory - German version; load indicates factor loading.

Kurre et al. BMC Ear, Nose and Throat Disorders 2010 10:3   doi:10.1186/1472-6815-10-3

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