Several dietary assessment methods are available, including the food frequency questionnaire (FFQ), diet history, weighed food record (WFR), and 24-hour dietary recall. Inaccurate dietary assessment methods may be a serious obstacle in understanding the impact of dietary factors on disease. Diets rich in energy and saturated fat and low in fruits and vegetables have been associated with the development of NCDs. Bland-Altman plots showed moderate agreement for energy-adjusted macronutrient intakes.Īccording to the World Health Organization, noncommunicable diseases (NCDs) remain to be the main cause of global premature mortality.

Mean cross-classification into exact agreement plus adjacent was 85% for nutrient intake and 83% for food groups. Crude unadjusted correlations for the EatWellQ8 FFQ and the 4-day WFR ranged from 0.40 to 0.88 (mean r=0.58, SD 0.13 95% CI 0.01-0.58 P=.01). Bland-Altman plots showed moderate agreement for both energy and energy-controlled nutrient intakes. Mean cross-classification into exact agreement plus adjacent was 84% for nutrient intake and 74% for food groups. The association between the EatWellQ8 FFQ and PFFQ varied, with crude unadjusted correlations ranging from 0.42 to 0.73 (mean r=0.46, SD 0.12 95% CI −0.02 to 0.84 P=.046). Mean cross-classification into exact agreement plus adjacent was 88% for nutrient intakes and 86% for food groups, and Bland-Altman plots showed good agreement for energy-adjusted macronutrient intakes.

Crude unadjusted correlations for repeated EatWellQ8 FFQs ranged from 0.37 to 0.93 (mean r=0.67, SD 0.14 95% CI 0.11-0.95) for nutrients and food groups ( P=.01). A total of 99 Kuwaiti participants (64/99, 65% female and 35/99, 35% male) completed the study-53 participated in the reproducibility study and the 4-day WFR validity study (mean age 37.1 years, SD 9.9) and 46 participated in the PFFQ validity study (mean age 36.2 years, SD 8.3).

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