Table 4. Intra-class correlation coefficients between two BDHQ3y implemented with an interval of one month for crude and energy-adjusted nutrient intakes and energy intake among 61 Japanese preschool children aged 3–4 years.

Nutrients	Unit	BDHQ3y_1a		BDHQ3y_2a		ICC
		mean	SD	mean	SD	Crude	Adjusted 1(R)b	Adjusted 2(D)b
Energy	kcal/day	1018.75	233.14	984.66	219.12	0.73	—	—
Protein	g/day	33.36	8.05	32.15	6.90	0.72	0.62	0.61
Fat	g/day	33.56	8.57	32.18	7.64	0.70	0.70	0.71
Saturated fat	g/day	11.51	3.27	11.23	3.42	0.61	0.62	0.64
Monounsaturated fat	g/day	11.19	3.02	10.68	2.64	0.72	0.72	0.72
Polyunsaturated fat	g/day	7.03	2.06	6.65	1.73	0.76	0.60	0.60
n-6 polyunsaturated fat	g/day	6.05	1.82	5.72	1.51	0.77	0.59	0.59
n-3 polyunsaturated fat	g/day	1.15	0.41	1.09	0.32	0.70	0.55	0.52
Marine-origin n-3c	g/day	0.29	0.18	0.27	0.14	0.60	0.56	0.52
Eicosapentaenoic acid	g/day	0.09	0.06	0.09	0.05	0.58	0.54	0.50
Docosahexaenoic acid	g/day	0.17	0.10	0.15	0.08	0.61	0.57	0.56
α-linolenic acid	g/day	0.83	0.28	0.80	0.22	0.72	0.54	0.53
Cholesterol	mg/day	152.42	54.09	143.65	49.06	0.80	0.80	0.79
Carbohydrate	g/day	143.27	35.85	138.99	35.06	0.73	0.68	0.69
Total dietary fiber	g/day	5.58	2.05	5.24	1.88	0.81	0.75	0.77
Soluble dietary fiber	g/day	1.38	0.55	1.28	0.49	0.78	0.74	0.75
Insoluble dietary fiber	g/day	4.14	1.49	3.90	1.37	0.81	0.74	0.77
Retinol	µg/day	163.35	57.25	155.91	56.82	0.52	0.48	0.49
Vitamin A (retinol equivalent)d	µg/day	256.48	93.20	246.37	92.67	0.58	0.54	0.54
α-carotene	µg/day	165.16	110.34	164.26	118.01	0.63	0.64	0.63
β-carotene	µg/day	920.16	588.75	888.68	640.95	0.66	0.65	0.64
β-carotene equivalente	µg/day	1111.25	657.46	1080.84	720.39	0.67	0.66	0.66
Cryptoxanthin	µg/day	184.56	180.05	187.22	177.62	0.60	0.56	0.56
Vitamin D	µg/day	4.04	2.36	3.72	1.65	0.61	0.52	0.50
α-tocopherol	mg/day	3.43	0.99	3.23	0.88	0.76	0.69	0.70
Vitamin K	µg/day	98.27	57.37	91.70	47.62	0.71	0.66	0.67
Thiamin	mg/day	0.39	0.09	0.38	0.08	0.72	0.63	0.57
Riboflavin	mg/day	0.71	0.18	0.70	0.20	0.56	0.49	0.56
Niacin	mg/day	5.62	2.00	5.27	1.56	0.73	0.61	0.59
Vitamin B6	mg/day	0.52	0.16	0.49	0.13	0.76	0.71	0.69
Vitamin B12	µg/day	3.01	1.51	2.87	1.10	0.70	0.66	0.64
Folate	µg/day	121.37	40.69	115.03	38.73	0.73	0.64	0.64
Pantothenic acid	mg/day	3.41	0.83	3.33	0.80	0.64	0.57	0.58
Vitamin C	mg/day	45.52	21.67	43.95	21.56	0.70	0.64	0.63
Sodium	mg/day	2389.75	606.73	2273.21	542.56	0.76	0.56	0.55
Potassium	mg/day	1219.06	334.21	1184.11	326.53	0.72	0.62	0.62
Calcium	mg/day	399.87	121.14	398.47	141.85	0.62	0.62	0.63
Magnesium	mg/day	125.67	33.41	120.49	30.73	0.77	0.58	0.58
Phosphorus	mg/day	575.35	132.06	559.61	130.95	0.68	0.61	0.62
Iron	mg/day	3.37	1.08	3.19	0.91	0.82	0.70	0.71
Zinc	mg/day	4.19	0.94	4.08	0.86	0.74	0.63	0.62
Copper	mg/day	0.60	0.18	0.58	0.16	0.82	0.67	0.69
Manganese	mg/day	1.49	0.47	1.43	0.44	0.77	0.72	0.72

BDHQ3y, brief-type self-administered diet history questionnaire for preschool children; ICC, intra-class correlation coefficient (Case 1); SD, standard deviation.

Log-transformed energy and nutrient intake values were used for the calculation of intraclass correlation coefficient.

^aThe column for BDHQ3y_1 shows the crude energy and nutrient intake values estimated by the BDHQ3y implemented at the beginning of the study period. That for BDHQ3y_2 shows those estimated by the BDHQ3y implemented at the end of the study period.

^bAdjusted 1(R) shows the energy-adjusted nutrient intake values by the residual method. Adjusted 2(D) shows those adjusted by the density method.

^cSum of eicosapentaenoic acid, docosapentaenoic acid, and docosahexaenoic acid.

^dSum of retinol, β-carotene/12, α-carotene/24, and cryptoxanthin/24.

^eSum of β-carotene, α-carotene/2, and cryptoxanthin/2.