Measurement structure of the Pain Self-Efficacy Questionnaire in a sample of Chinese patients with chronic pain.
OBJECTIVE
To examine the factorial structure of the Chinese translation of the Pain Self-Efficacy Questionnaire in a sample of Chinese patients with chronic pain.


METHODS
Outpatient physiotherapy department in a local hospital and a local rehabilitation clinic.


METHODS
One hundred and twenty patients with chronic pain in physiotherapy treatment.


METHODS
Each participant was asked to complete the Chinese version of the Pain Self-Efficacy Questionnaire, visual analogue scale (VAS), modified Roland Morris Disability Questionnaire, and Short Form Health Survey (SF-36). The test structure of the Pain Self-Efficacy Questionnaire was evaluated by confirmatory factor analysis. Highly correlated paths were added onto the initial structure for improving the final construct for the Pain Self-Efficacy Questionnaire. The correlations between the Chinese Pain Self-Efficacy Questionnaire and related measurements were computed using Pearson product-moment correlation coefficients.


RESULTS
Confirmatory factor analysis indicated that the one-factor model provided the best fit between the model and data, with the chi-square of the respecified model computed to be 36.79 (33, N = 120), the goodness-of-fit index 0.940, cumulative fit index 0.996, and the root mean square error of approximation 0.031. The item-total correlations ranged from 0.70 to 0.85. Cronbach's alpha of the Chinese version of the Pain Self-Efficacy Questionnaire was computed to be 0.94. The total scores also correlated significantly with the modified Roland Morris Disability Questionnaire and six subscales of SF-36.


CONCLUSIONS
A single-factor model confirmed the unidimensionality of the Chinese version of the Pain Self-Efficacy Questionnaire in a sample of Chinese patients with chronic pain. It demonstrated good internal consistency reliability and construct-related validity.
Vong
Sinfia K S
SK
Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China.
Cheing
Gladys L Y
GL
Chan
Chetwyn C H
CC
Chan
Fong
F
Leung
Arran S L
AS
D000293:Adolescent; D000328:Adult; D000368:Aged; D000554:Ambulatory Care Facilities; D002681:China; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000208:ethnology / Q000523:psychology*; D015203:Reproducibility of Results; D020377:Self Efficacy; D011795:Surveys and Questionnaires; D055815:Young Adult