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Eye Examinations as a Gold Standard to Evaluating Survey Instruments

NCT02244060 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 4320

Last updated 2015-04-07

No results posted yet for this study

Summary

Objective measures of health are relatively expensive; meanwhile, self-reports are critiqued to be subjective and not comparable. A middle ground approach is to apply the frontier work of vignette methods. The aim of the survey experiment is to explore the validity of survey instruments to identify students who need glasses, using objectively measured visual acuity as a gold standard. It is hypothesized that direct comparison against vignette (DCV) is significantly different from indirect comparison against vignette (ICV); meanwhile, self-assessment of vision (SAV) is significantly different from primed self-assessment of vision (PSAV). It is also hypothesized that DCV is a more valid survey instrument than ICV to classify students who need glasses, using objective visual acuity as a gold standard. Lastly, it is hypothesized that priming effect from vignettes improves the validity of self-assessment. It is planned to enroll 3,755 subjects in the survey experiment.

Conditions

  • Self Report
  • Questionnaire Design

Interventions

OTHER

Priming effect from vignette

In the arm of DCV, the self-assessed vision (PSAV) is listed after the vignette questions; however, in the arm of ICV, the self-assessment of vision (SAV) is listed before the vignette questions. Priming effect from vignette will be estimated by comparing those two randomized variables (i.e., SAV and PSAV).

Sponsors & Collaborators

  • Jingning County in Zhejiang Province in China

    collaborator UNKNOWN

  • Harvard School of Public Health (HSPH)

    lead OTHER

Principal Investigators

  • Linyu Su · Jingning Health Center

Study Design

Allocation
RANDOMIZED
Masking
SINGLE
Model
PARALLEL

Eligibility

Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2014-09-30
Primary Completion
2014-10-31
Completion
2014-10-31

Countries

  • China

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT02244060 on ClinicalTrials.gov