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Assessing Calcium Intake in Postmenopausal Women
Preventing Chronic Disease, 09/17/09

Plawecki KL et al. – The calcium–focused food frequency questionnaire (CFFFQ) can be used to identify postmenopausal women with inadequate calcium intakes (<800 mg/d) and to identify key sources of dietary calcium. Older black women consume less daily calcium than do older white women.

Methods

The authors studied a convenience sample of 46 black and 139 white postmenopausal women. Participants completed a multiple–pass interview for 24–hour recall of foods eaten and the 46–item CFFFQ.

Results

The correlation between measures for total daily calcium intake was moderately strong.
The CFFFQ estimated greater total daily calcium intake than did the 24–hour recall.
As daily calcium intake increased, the 24–hour recall increasingly underreported calcium compared with the CFFFQ.
Cross–tabulation and x^2 analyses found that the CFFFQ had greater specificity for lower calcium intakes. For calcium classified by food groups, there was moderate correlation for dairy and fruits.
The CFFFQ overestimated mean total calcium compared with the 24–hour recall by 221 mg/d, including within racial groups (195 mg/d for black women, and 229 mg/d for white women).
Dairy was the primary calcium source for both groups (55% of intake for black women and 57% of intake for white women).

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