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. 2020 Jul 23;23(18):3295–3303. doi: 10.1017/S1368980020001627

Table 5.

Validity and reproducibility estimates by semi-quantitative FFQ (SFFQ) for major food contributors to flavonoid intake in Men’s Lifestyle Validation Study and Women’s Lifestyle Validation Study (reference methods: 7-d dietary records (7DDR))

r s * 95 % CI ICC
Men
 Apple 0·78 0·70, 0·83 0·71
 Blueberry 0·77 0·70, 0·82 0·72
 Grapefruit 0·79 0·71, 0·85 0·71
 Onion 0·43 0·34, 0·51 0·62
 Orange 0·81 0·67, 0·90 0·39
 Orange juice 0·88 0·85, 0·90 0·40
 Red wine 0·88 0·85, 0·91 0·88
 Soya milk 0·89 0·84, 0·92 0·74
 Strawberry 0·74 0·62, 0·83 0·63
 Tea 0·71 0·66, 0·75 0·77
 Tofu 0·54 0·45, 0·62 0·62
Women
 Apple 0·63 0·54, 0·70 0·66
 Blueberry 0·67 0·61, 0·73 0·70
 Grapefruit 0·77 0·59, 0·88 0·67
 Onion 0·48 0·37, 0·56 0·62
 Orange 0·44 0·39, 0·48 0·37
 Orange juice 0·82 0·79, 0·85 0·38
 Soya milk 0·83 0·80, 0·86 0·66
 Red wine 0·83 0·80, 0·86 0·86
 Strawberry 0·67 0·52, 0·79 0·59
 Tea 0·72 0·67, 0·75 0·75
 Tofu 0·59 0·47, 0·68 0·67

ICC, rank intraclass correlation coefficient; r s , Spearman’s rank correlation coefficient.

*

Values represent r s comparing the second SFFQ with the average of 2 weeks of weighed 7DDR.

Values represent the ICC comparing the first and second SFFQ.

The r s not deattenuated for random measurement error because of high within-person variation in intake (see online supplementary material, Supplemental Table 6).