Table 2.

Distribution of vitamin D intake (μg/day) in the study subjects compared to US populations.

Quintiles range
	I	II	III	IV	V
Present study (control subjects)	<1.6	1.6–2.1	2.1–2.7	2.7–3.7	≥3.7
Weinstock et al.(10),a	2.6	2.6–4.7	4.7–6.6	6.7–9.9	>9.9
Millen et al.(11)	≤1.5	1.5–2.8	2.8–4.7	4.7–8.0	>8.0
Quartiles range
	I	II	III	IV
Present study (control subjects)	<1.8	1.8–2.4	2.4–3.4	>3.4
Asgari et al.(7)	<3.0	3.0–4.7	4.7–7.1	>7.1

^aIncluding dietary supplements