Figure 2.

Relationship between daily time spent outdoors and serum 25-OH vitamin D levels. A scatterplot of the average hours per day spent outside vs. serum 25-OH vitamin D shows no correlation between the two. The median time spent outdoors was 3 hours/day (IQR 2–4).

Bose et al. Nutrition Journal 2013 12:81   doi:10.1186/1475-2891-12-81
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