Psychometric properties of the Swedish version of the selection, optimization, compensation questionnaire.
BACKGROUND
The model of selection, optimization and compensation has been proposed as a model of adaptive management strategies throughout the lifespan.


OBJECTIVE
The aim of this study was to test the psychometric properties of a translated Swedish version of the 12-item selection, optimization, and compensation (SOC) questionnaire.


METHODS
The 12-item SOC questionnaire is composed of four subscales: elective selection (ES), loss-based selection, optimization and compensation. A convenience sample of 122 Swedish-speaking people, aged 19-85, participated in a study of the validity and reliability of the SOC questionnaire. Cronbach's alpha coefficient, corrected item-total correlation and Cronbach's alpha if item deleted were used for reliability testing. Two other scales, the ways of coping questionnaire and Rosenberg's self-esteem scale, were used to test convergent validity, and the geriatric depression scale was used to test discriminant validity. Stability over time was evaluated using a test-retest model with a 2-week interval.


RESULTS
The 12-item SOC questionnaire showed a Cronbach's alpha value of 0.50, and the subscales ranged from α = 0.16 to α = 0.64. Two items in the ES subscale had negative values on the corrected item-total correlation and showed substantial improvement (>0.05) in Cronbach's alpha when item deleted. When these two items that influenced internal consistency were deleted, Cronbach's alpha rose to 0.68.


CONCLUSIONS
The Swedish version of the 12-item SOC questionnaire showed deficiencies in a test of internal consistency because of two items in the ES subscale, and these two items were deleted. A consequence of the reduction is a weakening of the ES subscale and thereby to some extent the SOC questionnaire in total. Further testing is advisable. However, the 10-item SOC questionnaire was acceptable in a test of validity and reliability.
Department of Nursing, Umeå University, Umeå, Sweden. kerstin.viglund@nurs.umu.se
Kerstin
K
Viglund
Lena
L
Aléx
Elisabeth
E
Jonsén
Berit
B
Lundman
Astrid
A
Norberg
Regina Santamäki
RS
Fischer
Gunilla
G
Strandberg
Björn
B
Nygren
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D011795:Surveys and Questionnaires; D013548:Sweden