Construct validation of the dietary inflammatory index among postmenopausal women
Department of Medicine, Division of Preventive and Behavioral Medicine; UMass Worcester Prevention Research Center
Aged; Biomarkers; C-Reactive Protein; *Diet; Female; Humans; Inflammation; Interleukin-6; Linear Models; Logistic Models; Middle Aged; *Postmenopause; Receptors, Tumor Necrosis Factor, Type II
Clinical Epidemiology | Community Health and Preventive Medicine | Dietetics and Clinical Nutrition | Epidemiology | Preventive Medicine | Women's Health
PURPOSE: Many dietary factors have either proinflammatory or anti-inflammatory properties. We previously developed a dietary inflammatory index (DII) to assess the inflammatory potential of diet. In this study, we conducted a construct validation of the DII based on data from a food frequency questionnaire and three inflammatory biomarkers in a subsample of 2567 postmenopausal women in the Women's Health Initiative Observational Study.
METHODS: We used multiple linear and logistic regression models, controlling for potential confounders, to test whether baseline DII predicted concentrations of interleukin-6, high-sensitivity C-reactive protein (hs-CRP), tumor necrosis factor alpha receptor 2, or an overall biomarker score combining all three inflammatory biomarkers.
RESULTS: The DII was associated with the four biomarkers with beta estimates (95% confidence interval) comparing the highest with lowest DII quintiles as follows: interleukin-6: 1.26 (1.15-1.38), Ptrend < .0001; tumor necrosis factor alpha receptor 2: 81.43 (19.15-143.71), Ptrend = .004; dichotomized hs-CRP (odds ratio for higher vs. lower hs-CRP): 1.30 (0.97-1.67), Ptrend = .34; and the combined inflammatory biomarker score: 0.26 (0.12-0.40), Ptrend = .0001.
CONCLUSIONS: The DII was significantly associated with inflammatory biomarkers. Construct validity of the DII indicates its utility for assessing the inflammatory potential of diet and for expanding its use to include associations with common chronic diseases in future studies.
Construct validation, Dietary inflammatory index, Inflammatory biomarkers, Women's Health Initiative
DOI of Published Version
Ann Epidemiol. 2015 Jun;25(6):398-405. doi: 10.1016/j.annepidem.2015.03.009. Epub 2015 Mar 19. Link to article on publisher's site
Annals of epidemiology
Tabung, Fred K.; Steck, Susan E.; Zhang, Jiajia; Ma, Yunsheng; Liese, Angela D.; Agalliu, Ilir; Hingle, Melanie; Hou, Lifang; Hurley, Thomas G.; Jiao, Li; Martin, Lisa W.; Millen, Amy E.; Park, Hannah L.; Rosal, Milagros C.; Shikany, James M.; Shivappa, Nitin; Ockene, Judith K.; and Hebert, James R., "Construct validation of the dietary inflammatory index among postmenopausal women" (2015). Preventive and Behavioral Medicine Publications. 351.