Table 2.
The four factor solution of the principal component analysis
| Factor 4.1 | Factor 4.2 | Factor 4.3 | Factor 4.4 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Item | Abbreviated item description | Effect of dizziness and unsteadiness on emotion and participation | Specific activities/movements provoking dizziness or unsteadiness | Contextual factors or effort provoking dizziness and unsteadiness | Dependence of others/fear | ||||
| load | CI-TC | Load | CI-TC | load | CI-TC | load | CI-TC | ||
| E 23 | feeling depressed | 0.788 | 0.68 | ||||||
| E 2 | feeling frustrated | 0.765 | 0.60 | ||||||
| F 24 | job/house responsibilities | 0.685 | 0.71 | ||||||
| E 21 | feeling handicapped | 0.663 | 0.76 | ||||||
| E 10 | embarrassed in front of others | 0.623 | 0.38 | ||||||
| F 6 | restriction of social activities | 0.578 | 0.74 | ||||||
| E 22 | stressed relationships | 0.559 | 0.65 | ||||||
| F 3 | restriction of travel | 0.477 | 0.65 | ||||||
| E 18 | difficulties in concentrating | 0.452 | 0.49 | ||||||
| Cronbachs alpha | 0.88 | ||||||||
| P 13 | turning over in bed | 0.824 | 0.56 | ||||||
| F 5 | getting into or out of bed | 0.751 | 0.56 | ||||||
| P 1 | looking up | 0.672 | 0.49 | ||||||
| P 11 | quick head movements | 0.656 | 0.52 | ||||||
| P 25 | bending over | 0.589 | 0.49 | ||||||
| F 7 | difficulties in reading | 0.193 | 0.265 | 0.27 | 0.124 | 0.169 | |||
| Cronbachs alpha | 0.74 | ||||||||
| P 17 | walking down a sidewalk | 0.738 | 0.59 | ||||||
| F 19 | walking around in dark | 0.715 | 0.44 | ||||||
| E 15 | afraid of appearing intoxicated | 0.603 | 0.51 | ||||||
| P 8 | ambitious activities like sports | 0.539 | 0.63 | ||||||
| P 4 | walking down a supermarket aisle | 0.502 | 0.48 | ||||||
| F 12 | avoid heights | 0.482 | 0.48 | ||||||
| F 14 | strenuous housework | 0.412 | 0.64 | ||||||
| Cronbachs alpha | 0.80 | ||||||||
| E 20 | afraid to stay home alone | 0.759 | 0.52 | ||||||
| E 9 | afraid of leaving home alone | 0.707 | 0.70 | ||||||
| F 16 | walking by yourself | 0.512 | 0.62 | ||||||
| Cronbachs alpha | 0.77 | ||||||||
The table indicates 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 4-factor solution explained 54.5% 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.