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Development and validation of quality of life instruments for chronic diseases—Chronic gastritis version 2 (QLICD-CG V2.0)

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  • Peng Quan
  • Lei Yu
  • Zheng Yang
  • Pingguang Lei
  • Chonghua Wan
  • Ying Chen

Abstract

Quality of life is an important outcome indicator to evaluate whether treatment is successful or not. Chronic gastritis leads to ongoing deterioration of subjectively perceived quality of life. There are several generic measures, but they are not developed particularly to assess chronic gastritis problems. The Quality of Life Instruments for Chronic Diseases—Chronic Gastritis (QLICD-CG V2.0) questionnaire is a 39-item, multi-dimensional, self-report instrument to assess chronic gastritis patients’ perception of their health related quality of life in four domains. The instrument was developed in China. The current study aimed to evaluate the psychometric properties of the QLICD-CG V2.0. 194 patients with chronic gastritis were enrolled from 4 hospitals in China. The QLICD-CG V2.0 was administered to patients by trained research assistants. In addition, their demographic characteristics were also recorded. The psychometric testing included construct validity, convergent validity, discriminant validity, test-retest, and responsiveness. The results showed good internal consistency and acceptable floor and ceiling effects (Cronbach’s alpha range from 0.80 to 0.93). CFA showed that the instrument structure has a reasonable fitness (RMSEA = 0.063, 95%CI = [0.057 0.079], CFI = 0.93, GFI = 0.95, SRMR = 0.028). The convergent validity was considered appropriate, with 38 of the 39 items correlated stronger with their assigned scale than a competing scale, except for GPS1. Known groups comparisons showed that the QLICD-CG V2.0 discriminated well between subgroups on the basis of gender, marriage status, and economy status, thus providing evidence of discriminative validity. Convergent validity testing revealed that the QLICD-CG V2.0 domain scores correlated significantly with SF-36 dimension scores, which ranged from 0.21 to 0.58. Test-retest coefficients were satisfactory. A majority of intraclass correlation coefficients were above 0.70, except the psychological domain (0.60) and the items of social support/security (0.61). Responsiveness was tested on 157 patients. Significant differences were found on all QLICD-CG V2.0 domains, between baseline responses and after a treatment, except for the items of appetite and sleep. Robust sensitivity to change was observed. The QLICD-CG V2.0 appears to be a valid and reliable instrument to measure QOL in chronic gastritis patients. Scores were reproducible.

Suggested Citation

  • Peng Quan & Lei Yu & Zheng Yang & Pingguang Lei & Chonghua Wan & Ying Chen, 2018. "Development and validation of quality of life instruments for chronic diseases—Chronic gastritis version 2 (QLICD-CG V2.0)," PLOS ONE, Public Library of Science, vol. 13(11), pages 1-12, November.
    • Handle: RePEc:plo:pone00:0206280
    DOI: 10.1371/journal.pone.0206280
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    1. Lee Cronbach, 1951. "Coefficient alpha and the internal structure of tests," Psychometrika, Springer;The Psychometric Society, vol. 16(3), pages 297-334, September.
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