Table 4.

Associations of calcium intake with bone mineral content and areal bone mineral density at the spine for participants in the BMDCS intermethod reliability substudy

	Bone Mineral Content			Bone Mineral Density
	β	(SE)	p-value	β	(SE)	p-value
All subjects (n = 358)
FFQ
Uncorrected	0.016	0.014	0.27	0.011	0.012	0.36
Calibration correcteda	0.051	0.047	0.28	0.035	0.038	0.36
Black (n = 76)
FFQ
Uncorrected	0.018	0.030	0.55	0.001	0.025	0.97
Calibration correcteda	0.110	0.192	0.57	0.006	0.153	0.97
Hispanic (n = 64)
FFQ
Uncorrected	−0.055	0.028	0.05	−0.032	0.022	0.15
Calibration correcteda	−0.228	0.144	0.11	−0.134	0.105	0.20
White (n = 175)
FFQ
Uncorrected	0.054	0.023	0.02	0.041	0.019	0.03
Calibration correcteda	0.152	0.069	0.03	0.116	0.057	0.04

Abbreviations: SE, standard error; BMDCS, Bone Mineral Density in Childhood Study; FFQ, food frequency questionnaire.

Notes: Associations for natural log-log models. All models adjusted for age (continuous), sex, race (black vs. non-black), height (continuous), total physical activity (continuous), tanner stage, and clinical center in the calibration and health parameter models where appropriate. Subjects who refused Tanner staging (n=30) or did not undergo bone mineral content/density testing (n=5) were excluded from analyses.

^aCalibration correction performed using the method described by Spiegelman et al.²⁷ for linear regression.