S M Saw1, F J Nieto, J Katz, S J Chew. 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.
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.
Authors: Lisa A Jones-Jordan; G Lynn Mitchell; Susan A Cotter; Robert N Kleinstein; Ruth E Manny; Donald O Mutti; J Daniel Twelker; Janene R Sims; Karla Zadnik Journal: Invest Ophthalmol Vis Sci Date: 2011-03-29 Impact factor: 4.799
Authors: Lisa A Jones-Jordan; Loraine T Sinnott; Susan A Cotter; Robert N Kleinstein; Ruth E Manny; Donald O Mutti; J Daniel Twelker; Karla Zadnik Journal: Invest Ophthalmol Vis Sci Date: 2012-10-01 Impact factor: 4.799