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RCT Randomized controlled trial

RDA Recommended Dietary Allowance

RECORD Randomised Evaluation of Calcium and/Or vitamin D trial

RIA Radioimmunoassay

RNI Recommended Nutrient Intake

RR Relative risk

SD Standard deviation

SE Standard error

SEM Standard error of the mean

SLE Systemic lupus erythematosus

SPA Single-photon absorptiometry

SPF Sun protection factor

SRM Standard Reference Material

TB Tuberculosis; Total body

Th T helper

TH Total hip

Tr Trochanter

TRPV6 Transient receptor potential cation channel, vanilloid family member 6

Tx Treatment

UK United Kingdom

UL Tolerable Upper Intake Level

U.S. United States

USDA U.S. Department of Agriculture

UV Ultraviolet

UVB Ultraviolet B

VDDR Vitamin D–dependent rickets

VDR Vitamin D receptor

VDRE Vitamin D–responsive element

VEGF Vascular endothelial growth factor

WHI Women’s Health Initiative

WWEIA What We Eat in America

wk Week(s)

y Year(s)

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