Development and relative validation of a food frequency questionnaire for French-Canadian adolescent and young adult survivors of acute lymphoblastic leukemia

Table 4 Food frequency questionnaires and 3-day food records: cross-classification analysis of energy and nutrient intakes

	% Classified into same quartile¹	% Classified into same ±1 quartile^a	% Misclassified^b	Weighted^b Kappa
Energy	47.5	40.0	12.5	0.64
Protein	45.0	37.5	17.5	0.52
CHO	45.0	32.5	22.5	0.46
Lipids	51.3	40.0	8.7	0.70
SFA	50.0	36.3	13.7	0.63
MUFA	35.0	51.3	13.7	0.55
PUFA	48.7	35.0	16.3	0.58
Cholesterol	30.0	51.3	18.7	0.42
Dietary fiber	46.3	30.0	23.7	0.43
Alcohol	57.5	28.7	13.8	0.67
Vitamin A	41.3	33.7	25.0	0.44
Vitamin C	38.7	43.8	17.5	0.47
Vitamin E	41.3	40.0	18.7	0.47
Vitamin D	40.0	41.3	18.7	0.51
Calcium	53.7	33.8	12.5	0.64
Iron	40.0	36.3	23.7	0.37
Folate	37.5	43.7	18.8	0.45

Values are expressed in percentage, N = 80
3-DFR 3-day food record, FFQ food frequency questionnaire, CHO carbohydrates, SFA saturated fatty acids, MUFA monounsaturated fatty acids, PUFA polyunsaturated fatty acids
^aCross-classification analyses were completed to validate agreement between FFQ and 3-DFR in terms of proportions of participants classified into the same or same ±1 quartile or misclassified
^bWeighted kappa was used to measure the agreement between FFQ and 3-DFR. Analyses were completed on crude values not adjusted for energy intake

ISSN: 1475-2891