In Reply: Given the recent attention surrounding vitamin D, the request by Dr Shil and colleagues to explore intake in relation to physical function is a compelling question. In response, we conducted a cross-sectional analysis of our baseline data (n = 641).1 As described in the main outcomes article, telephone interviews were used to gather data on diet and supplement use, through 2 unannounced 24-hour recalls (multipass method with the Nutrition Data System for Research software, version 2006; Nutrition Coordinating Center, Minneapolis, Minnesota), and to assess physical function, which was captured using 3 instruments: physical function subscales of the Medical Outcomes Study Short-Form 36 (SF-36) and the basic and advanced lower extremity function subscales of the Late Life Function and Disability Index, with higher scores indicating better function. Spearman partial correlation coefficients (ρ) were generated after controlling for sex, race, and age (Table).
Demark-Wahnefried W, Snyder DC, Morey MC. Functional Outcomes of Older Overweight Cancer Survivors After Diet and Exercise—Reply. JAMA. 2009;302(8):845-846. doi:10.1001/jama.2009.1210