Format

Send to

Choose Destination
See comment in PubMed Commons below
Ophthalmic Epidemiol. 1999 Dec;6(4):291-301.

Estimating the magnitude of close-up work in school-age children: a comparison of questionnaire and diary instruments.

Author information

1
National University of Singapore, Department of Community, Occupational, and Family Medicine, Singapore, Singapore. cofsawsm@nus.edu.sg

Abstract

BACKGROUND:

Numerous scientists have noted a relationship between close-up work and myopia.

METHODS:

A questionnaire and four 24-hour diaries were developed to estimate close-up work activity in a cohort study of close-up work and myopia progression in Singapore children. The number of hours per day that children engaged in each type of close-up work activity over a weekday and weekend during the school term, during the examination period, and in the vacation were estimated.

RESULTS:

The children spent an average of 6.6 hours per day on total weighted average close-up work, of which 4.3 hours were spent on reading and writing. The intra-class correlation coefficient for the reproducibility of the questionnaire was 0.87 (95% CI 0.85-0.91). The intra-class correlation coefficient for total weighted close-up work was 0.50 (95% CI 0.34-0.66) when the questionnaire was compared with the four 24-hour diaries. The amount of close-up work activity increased with age.

CONCLUSIONS:

A questionnaire for close-up work was developed and proven to be reproducible and comparable to four 24-hour diaries.

PMID:
10544343
[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Loading ...
    Support Center