Lookup NU author(s): Emeritus Professor Brian Diffey
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P>Background An important factor in determining our exposure to sunlight, and the consequent impact on skin health and vitamin D status, is the time we spend outdoors. Objectives To determine estimates of the typical times per day spent outdoors during weekdays, weekends and holidays during a summer season. Methods A number of published studies giving data on the time per day spent outdoors by people were reviewed and a meta-analysis performed. From these data summary estimates of the average time per day outdoors were extracted. Results Time spent per day outdoors during weekdays and weekends is positively skewed, with a normal distribution of times outdoors during holidays. The median times per day outdoors during weekdays and weekends gave pooled estimates of 1 center dot 04 and 1 center dot 64 h, respectively. Corresponding values for the pooled estimates of mean times outdoors during these two periods were 1 center dot 43 and 2 center dot 38 h. The mean time per day outdoors during holiday exposure is 5-6 h. Conclusions Summer-long distribution of times spent outdoors on a daily basis exhibits a highly skewed nature that highlights the difference between our adventitious and recreational exposure. Over the course of a summer season, when people are outside, they spend on average of 1-2 h per day outdoors.
Author(s): Diffey BL
Publication type: Article
Publication status: Published
Journal: British Journal of Dermatology
Print publication date: 04/04/2011
ISSN (print): 0007-0963
ISSN (electronic): 1365-2133
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