Eye Examinations as a Gold Standard to Evaluating Survey Instruments

NCT02244060 | Completed DMC

• 1 other identifier: vignette2014
• Study Type: interventional
• Target: 4,320
• Locations: 1 country
• Sites: 1

Brief 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

Keywords

Vignette; Priming effect

Outcome Measures

Primary Outcomes (4)

• Self-assessed vision

  One and half months

• Direct comparison against vignette (DCV)

  One and half months

• Indirect comparison against vignette (ICV)

  One and half months

• Primed self-assessed vision

  One and half months

Secondary Outcomes (1)

• Objectively measured vision

  One and half months

Study Arms (2)

Direct comparison

EXPERIMENTAL

The Direct comparison against vignette (DCV) questionnaire asks subjects to estimate their own vision against vignette situations.Priming effect from vignette is designed in the arm of DCV.

Other: Priming effect from vignette

Indirect comparison

NO INTERVENTION

The Indirect comparison against vignette (ICV) questionnaire asks self-assessed vision and single evaluation of vignettes.

Interventions

Priming effect from vignette OTHER

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).

Also known as: primed self-assessed vision, primed self-assessment of vision

Direct comparison

Eligibility Criteria

• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may qualify if:

• Middle school students (i.e., Grade 7 to Grade12) in Jingning County.

You may not qualify if:

• Primary school students (i.e., Grade 1 to Grade 6) in Jingning County.

Sponsors & Collaborators

• Harvard School of Public Health (HSPH): lead
• Jingning County in Zhejiang Province in China: collaborator

Study Sites (1)

Jingning County

Lishui, Zhejiang, 323500, China

Location

Study Officials

• Linyu Su

  Jingning Health Center

  STUDY DIRECTOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: PARTICIPANT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Doctoral Candidate

Study Record Dates

• First Submitted: September 14, 2014
• First Posted: September 18, 2014
• Study Start: September 1, 2014
• Primary Completion: October 1, 2014
• Study Completion: October 1, 2014
• Last Updated: April 7, 2015

Record last verified: 2015-04

Locations

CN (1)