Table 5.

Variance components and deattenuation of measurements

Variance components for unadjusted model	Variance
Between-person	0.18
Within-person	0.07
Sum of the variance components	0.25
ICC	0.72
Deattenuation factor	1.39
Variance components for adjusted model
Between-person	0.15
Within-person	0.06
Sum of the variance components	0.21
ICC	0.71
Reduction (%) of total random variation	15.1

Variance components are given for log-transformed 25(OH)D values. The model was adjusted for age, sex, race, BMI, supplement use, smoking status, latitude, ambient UVR exposure, season, and time (i.e. blood draw at time A or time B).