Table 1.

Characteristics of participants in the Bone Mineral Density in Childhood Study (BMDCS) calcium food frequency questionnaire reproducibility and intermethod reliability substudies

Characteristic	Reproducibility (n=69) substudy	Intermethod reliability (n=393) substudy
Age y, mean (SD)	14.5 (3.9)	13.1 (5.2)
Males, n (%)	31 (44.9)	184 (46.8)
Race/ethnicity, n (%)
Asian	8 (11.6)	20 (5.1)
Non-Hispanic black	10 (14.5)	81 (20.6)
Hispanic	12 (17.4)	68 (17.3)
Non-Hispanic white	36 (52.2)	194 (49.4)
Other	3 (4.4)	30 (7.6)
Height cm, mean (SD)	158.5 (17.8)	150.5 (22.3)
Tanner stage, n (%)
1	8 (11.6)	125 (31.8)
2	4 (5.8)	12 (3.1)
3	10 (14.5)	18 (4.6)
4	12 (17.4)	38 (9.7)
5	33 (47.8)	170 (43.3)
Missing	2 (2.9)	30 (7.6)

Abbreviations: SD, standard deviation.

Note: Values may not sum to total due to missing data.