Table 3.

Correlation between DR and FFQ_V and between two repeated FFQ and cross-classification analysis

	DR v. FFQ_V			Cross-classification (%)†			Weighted κ coefficient	FFQ_V v. FFQ_R
	Validity*							Reproducibility‡
	Crude	Energy-adjusted	De-attenuated§	Same category	Same and adjacent category	Extreme category		Crude	Energy-adjusted
Cohort I
Total trans-fatty acids (% total energy)
Men (n 102)	0·67	–	–	47	78	0	0·91	0·70	–
Women (n 113)	0·69	–	–	42	81	0	0·92	0·71	–
Total trans-fatty acids (g/d)
Men (n 102)	0·55	0·67	0·73	39	79	0	0·90	0·61	0·70
Women (n 113)	0·45	0·66	0·73	41	71	0	0·91	0·66	0·71
Industrial trans-fatty acids (g/d)
Men (n 102)	0·44	0·56	0·62	25	75	0	0·89	0·62	0·76
Women (n 113)	0·30	0·41	0·46	22	65	3	0·85	0·65	0·52
Ruminant trans-fatty acids (g/d)
Men (n 102)	0·59	0·60	0·68	41	76	0	0·89	0·61	0·59
Women (n 113)	0·61	0·60	0·68	35	77	1	0·89	0·63	0·64
Cohort II
Total trans-fatty acids (% total energy)
Men (n 174)	0·65	–	–	45	80	1	0·91	0·75	–
Women (n 176)	0·54	–	–	35	75	1	0·88	0·64	–
Total trans-fatty acids (g/d)
Men (n 174)	0·47	0·61	0·67	40	79	1	0·90	0·66	0·73
Women (n 176)	0·41	0·56	0·60	34	74	1	0·88	0·60	0·68
Industrial trans-fatty acids (g/d)
Men (n 174)	0·41	0·46	0·50	33	71	2	0·86	0·62	0·62
Women (n 176)	0·39	0·48	0·53	31	74	2	0·87	0·58	0·65
Ruminant trans-fatty acids (g/d)
Men (n 174)	0·49	0·50	0·57	33	75	2	0·87	0·63	0·61
Women (n 176)	0·50	0·54	0·60	36	76	2	0·88	0·67	0·64

DR, dietary record; FFQ_V, FFQ for validity study; FFQ_R, FFQ for reproducibility.

^*Spearman’s correlation between DR and FFQ_V.

^†Percentage shows the degree of agreement in the cross-classification according to the quintile of DR and the FFQ_V.

^‡Spearman’s correlation of the two repeated FFQ.

^§De-attenuated CC = energy-adjusted CC × is the ratio of within- to between-individual variance and n is the number of DR.