Table 1.

Classification of groups based on functional information on vitamin D metabolism.

Functional vitamin D deficiency	Both criteria fulfilled	VMR ≤ 4% and 24,25(OH)D2 ≤ 3 nmol/L
Suboptimal vitamin D metabolism	One criterium fulfilled	or
Functional vitamin D sufficiency	No criterium fulfilled	VMR ≥ 4% and 24,25(OH)2D ≥ 3 nmol/L

Note: Criteria 1 is VMR ≤ 4%; criteria 2 is 24,25(OH)₂D ≤ 3 nmol/L.