. Author manuscript; available in PMC: 2008 Mar 20.

Published in final edited form as: J Am Diet Assoc. 2007 May;107(5):752–759. doi: 10.1016/j.jada.2007.02.007

Table.

Subject characteristics of those completing three food frequency questionnaires and 7-day food records to assess dietary calcium intake in adults (n=341)

Sex (%)
Males	25.5
Females	74.5
Age (y)	38±11^a
Age (y) distribution (%)
19–30	58.6
31–50	27.3
51–70	13.5
>70	0.6
Body mass index^b	31.8±7.1^a
Range	17.8–54.7
Race/ethnicity (%)
Black or African American	29.9
White	61.3
Latino	4.4
Other	4.4
Socioeconomic status (%)^c
I	12.6
II	24.3
III	47.8
IV	13.2
V	2.1
Interval between completion of questionnaires and submission of food record (d)	16.8±9.8^a

Mean±standard deviation.

Calculated as kg/m².

By Hollingshead Scale, where I=high, V=low, based on occupation and income level (35).