The validity of a food frequency questionnaire as a measure of PUFA status in pregnancy

BMC Pregnancy and Childbirth

Isabelle Granville Smith¹  Bronwyn D Hegarty¹  Georgia McClure¹  Gordon Parker¹ 

[1] Black Dog Institute, Hospital Rd, Randwick 2031, NSW, Australia

关键词: Pregnancy;    Biomarkers;    Polyunsaturated fatty acid;    Food frequency questionnaire;   

Others  :  1139600
DOI  :  10.1186/s12884-015-0494-3

 received in 2014-08-29, accepted in 2015-03-03,  发布年份 2015

【 摘 要 】

Background

Nutritional studies have found conflicting evidence regarding the ability of Food Frequency Questionnaires (FFQs) to demonstrate convergent validity with tissue content of omega-3 and omega-6 polyunsaturated fatty acids (PUFAs). We therefore sought to assess the convergent validity of a FFQ strategy when compared with a blood biomarker of PUFA levels in a sample of pregnant women.

Method

A previously validated PUFA FFQ was completed by 895 pregnant women and compared to erythrocyte membrane of six PUFA variables.

Results

Four of the six correlations were found to be formally significant, however two of these demonstrated minimal associational strength. Moderate-high correlations between the FFQ-derived PUFA intake estimates and blood biomarker PUFA levels were shown only for eicosapentaenoic acid (EPA; 0.55) and docosahexaenoic acid (DHA; 0.61).

Conclusions

Overall, the correlations were lower than those found in general population studies. Findings suggest biological estimates, such as blood samples, may be most appropriate to measure PUFA levels above indirect strategies such as an FFQ in this population. The results, if an indirect strategy is unavoidable, indicate specific PUFAs where an FFQ strategy may be most informative.

【 授权许可】

   
2015 Parker et al.; licensee BioMed Central.

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