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Comment & Response |

Vitamin D Supplementation During First 12 Months of Life—Reply

Sina Gallo, RD, PhD1; Celia Rodd, MD, MSc1; Hope Weiler, RD, PhD1
[+] Author Affiliations
1School of Dietetics and Human Nutrition, McGill University, Montréal, Québec
JAMA. 2013;310(8):853-854. doi:10.1001/jama.2013.124272.
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In Reply Drs Sofiyan and Nanan highlight an important issue within the vitamin D research field. The estimation of sunlight exposure is often imprecise due to recall bias and is particularly challenging among children with sporadic patterns of exposure. We chose to estimate UV exposure using the sun index. Although more objective measures of UV exposure are available, such as dosimeters, they do not incorporate capacity for cutaneous vitamin D synthesis on the basis of body surface area (BSA) exposed.

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Figure.
Mean Sun Index for Infants Aged 1 to 12 Months

There were statistically significant (P < .05) differences in mean sun index values across time points.

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August 28, 2013
Ayman Sofiyan, MBBS; Ralph K. H. Nanan, Dr Med Habil, FRACP
1Department of Pediatrics, Nepean Hospital, Penrith, Australia
2Department of Pediatrics, Sydney Medical School, Sydney, Australia
JAMA. 2013;310(8):853. doi:10.1001/jama.2013.124263.
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