Psychometric analysis of the SPEED questionnaire and CLDEQ-8

TitlePsychometric analysis of the SPEED questionnaire and CLDEQ-8
Publication TypeJournal Article
Year of Publication2018
AuthorsPucker, A., B. Dougherty, L. Jones-Jordan, J. Kwan, C. E. Kunnen, and S. Srinivasan
JournalInvestigative Ophthalmology and Visual Science
Keywordsadult, adverse device effect, Article, chemistry, comparative study, contact lens, Contact Lens Dry Eye Questionnaire 8, Contact lens dry eye questionnaire-8 (CLDEQ-8), Contact lenses, Cross-Sectional Studies, cross-sectional study, diagnostic test, Dry eye, Dry eye disease, Dry Eye Syndromes, female, human, Humans, lacrimal fluid, ligament rupture, male, measurement accuracy, Meibomian gland dysfunction, middle aged, phenol red thread test, priority journal, Psychometrics, psychometry, quality of life, questionnaire, Rasch analysis, scoring system, self report, Sickness Impact Profile, Standard patient evaluation of eye dryness (SPEED), Standard Patient Evaluation of Eye Dryness Questionnaire, Surveys and Questionnaires, tear meniscus height, Tears, visual system parameters, young adult

PURPOSE. This study reports on the ability of the Standard Patient Evaluation of Eye Dryness (SPEED) questionnaire to detect dry eye (DE) symptoms in contact lens (CL) and non-CL wearers. METHODS. The SPEED questionnaire was administered to all subjects while the Contact Lens Dry Eye Questionnaire-8 (CLDEQ-8) was only administered to CL wearers. Tear meniscus heights (TMH) were measured, and the phenol red thread (PRT) test was conducted. These tests along with self-reported DE were used to identify subjects with dry eye disease (DED). Rasch analysis was performed to evaluate the questionnaires for measurement precision and unidimensionality, and the scores from these Rasch analyses were used to understand their ability to predict measures of DED. RESULTS. We enrolled 284 subjects (150 CL and 134 non-CL wearers). Mean subject age was 39.4 ± 14.2 years. Rasch analysis yielded a multidimensional short form of the SPEED questionnaire (8-items) and a unidimensional short form of the CLDEQ-8 (4-item). Scores from both questionnaires were significantly associated with self-reported DE in CL and non-CL wearers. Scores of the 8-item SPEED questionnaire were associated with DED status in non-CL wearers but not in CL wearers while 4-item CLDEQ scores were associated with DED status in CL wearers. TMH or PRT were not associated with either questionnaire in CL or non-CL wearers. CONCLUSIONS. The 8-item SPEED questionnaire demonstrated adequate measurement precision with evidence of quantifying multiple symptoms categories while the 4-item CLDEQ-8 primarily quantified DE symptoms. Questionnaire scores were associated with self-reported DE, which suggests that they may have utility in both populations analyzed. © 2018 The Authors.