Table 2.

Daily energy and nutrient intakes estimated by the 12 d dietary record (DR) and the validity between the 12 d DR and the first administration of the FFQ among Korean adults (n 126) aged 20–65 years residing in the Seoul metropolitan area, August 2009–May 2010

	12 d DR		Pearson correlation		Quartile classification (%)			Mean agreement (%)		Calibration factor
Energy/nutrients	Mean	sd	Crude	Adjusted*	Same	Same+adjacent	Opposite	Mean	95 % LOA†	λ 1 value‡	95 % CI
Energy (kJ)	8411·7	1930·6	0·43	-–	35	78	5	109	58, 205	0·191	0·097, 0·285
Energy (kcal)	2010·5	461·4	0·43	-–	35	78	5	109	58, 205	0·191	0·097, 0·285
Protein (g)	78·9	21·1	0·37	0·33	31	67	6	98	73, 32	0·213	0·114, 0·312
Fat (g)	51·9	16·4	0·45	0·54	43	81	2	89	54, 148	0·176	0·092, 0·260
Carbohydrate (g)	299	67	0·44	0·64	40	86	1	116	95, 42	0·444	0·326, 0·562
Ca (mg)	588	169	0·43	0·48	40	82	3	102	58, 179	0·231	0·147, 0·316
P (mg)	1262	315	0·37	0·45	36	81	4	105	82, 134	0·315	0·202, 0·429
Fe (mg)	16·3	5·5	0·36	0·38	33	75	6	96	60, 153	0·186	0·077, 0·296
K (mg)	3335	904	0·40	0·53	37	81	3	107	71, 162	0·280	0·188, 0·371
Na (mg)	5877	2087	0·36	0·23	26	72	10	91	50, 166	0·151	0·028, 0·274
Vitamin A (µg RE)	1083	510	0·27	0·22	26	66	10	73	35, 154	0·138	0·012, 0·264
Thiamin (mg)	1·47	0·45	0·39	0·15§	22	63	8	103	68, 155	0·091	−0·028, 0·210
Riboflavin (mg)	1·46	0·44	0·37	0·38	35	75	8	87	58, 132	0·236	0·129, 0·343
Niacin (mg)	18·6	5·0	0·29	0·29	33	67	6	98	71, 135	0·215	0·086, 0·345
Vitamin C (mg)	117	43	0·37	0·47	36	80	6	108	52, 224	0·258	0·158, 0·357

LOA, limit of agreement; RE, retinol equivalents.

^*Natural log-transformed, de-attenuated and energy-adjusted intake of nutrients by the Multiple Source Method.

^†LOA determined as the mean difference±1·96×sd of the difference.

^‡Natural log-transformed energy intake estimated from the FFQ1 (independent variable) and from the mean of 12 d DR (dependent variable).

All coefficients were significant except those marked with §.