Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/113467
Title: Estimating the magnitude of close-up work in school-age children: A comparison of questionnaire and diary instruments
Authors: Saw, S.-M. 
Nieto, F.J.
Katz, J.
Chew, S.-J.
Keywords: Close-up work
Diaries
Myopia
Questionnaire reliability
Risk factors
School children
Validity
Issue Date: 1999
Source: Saw, S.-M.,Nieto, F.J.,Katz, J.,Chew, S.-J. (1999). Estimating the magnitude of close-up work in school-age children: A comparison of questionnaire and diary instruments. Ophthalmic Epidemiology 6 (4) : 291-301. ScholarBank@NUS Repository.
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.
Source Title: Ophthalmic Epidemiology
URI: http://scholarbank.nus.edu.sg/handle/10635/113467
ISSN: 09286586
Appears in Collections:Staff Publications

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