Table 4.

Least square mean of baseline serum 25(OH)D and 1,25(OH)₂D by calcium intake among 275 men in a PLCO substudy

	N	25(OH)D (nmol/L)			1,25(OH)₂D (pmol/L)
	N			Least squares mean (95% CI)*	P	Least squares mean (95% CI)*	P
Dietary calcium (mg/d)
<750	82	53.28 (39.43-67.13)	0.87	78.72 (65.04-92.41)	0.34
571-1,000	76	49.91 (36.70-63.12)		84.12 (71.07-97.18)
1,001-1,500	67	51.56 (37.97-65.14)		76.26 (62.81-89.71)
≥1,500	47	53.29 (38.79-67.79)		80.24 (65.89-94.59)
Supplementary calcium (mg/d)
0	147	49.33 (33.91-64.75)	0.55	78.04 (62.78-93.30)	0.67
1-399	83	51.47 (38.49-64.45)		82.49 (69.63-95.33)
≥400	42	55.25 (41.40-69.11)		78.03 (64.31-91.75)

↵* Least squares means of serum 25(OH)D and 1,25(OH)₂D were adjusted for vitamin D, supplemental vitamin D, race, season of blood draw, body mass index, physical activity, study center, and age.