Table 3.

Repeatability of the food frequency questionnaire (FFQ) shown by mean (SD) daily estimates of nutrients and Pearson correlation between the crude and energy-adjusted estimations derived from the first and second FFQs (n=54)

	Daily intakes			Pearson correlation coefficient
	FFQ1	FFQ2	FFQ2 (% FFQ1)	Crude	Energy-adjusted
Energy, kcal$	1,814 (497)	1,721 (526)*	95	0.78	–
Protein, g	80.3 (24.4)	78.9 (27.6)	98	0.80	0.79
Carbohydrate, g	189 (53)	171 (55)*	91	0.67	0.70
Fat, g	77.9 (30.9)	76.4 (33.8)	98	0.81	0.71
MUFA, g	31.6 (14.7)	31.8 (17.0)	101	0.78	0.74
PUFA, g§	12.2 (7.1)	12.3 (8.3)	101	0.84	0.76
SFA, g	27.3 (10.7)	25.8 (11.2)	95	0.83	0.67
Cholesterol, mg	261 (116)	265 (122)	101	0.87	0.85
Fiber, g	22.1 (7.0)	19.4 (7.1)*	88	0.62	0.59
Vitamin A, µg§	417 (368)	421 (416)	101	0.86	0.76
Thiamine, mg§	1.3 (0.4)	1.3 (0.5)	96	0.77	0.77
Riboflavin, mg§	1.9 (0.8)	1.7 (0.8)*	93	0.89	0.87
Niacin, mg§	18.8 (6.6)	18.6 (7.6)	99	0.82	0.79
Pantothenic acid, mg§	6.0 (2.2)	5.6 (2.2)*	93	0.86	0.83
Pyridoxine, mg	2.0 (0.7)	1.9 (0.7)	95	0.85	0.83
Folic acid, µg	357 (122)	316 (115)*	88	0.77	0.78
Cobalamin, µg§	5.1 (3.1)	5.2 (3.5)	103	0.90	0.89
Vitamin C, mg	165 (71.2)	140 (59.6)*	85	0.67	0.68
Vitamin D, µg§	2.8 (1.9)	3.1 (2.5)	111	0.80	0.68
Vitamin E, mg§	12.7 (6.8)	11.9 (7.0)	94	0.83	0.79
Calcium, mg§	710 (319)	648 (345)*	91	0.83	0.80
Iron, mg	13.5 (4.2)	12.6 (4.3)*	93	0.84	0.83
Magnesium, mg	278 (78.7)	255 (80.9)*	92	0.80	0.80
Zinc, mg	10.1 (3.1)	9.6 (3.1)	95	0.80	0.79
Selenium, µg	51.6 (20.2)	52.3 (23.8)	101	0.85	0.84
Phosphorus, mg	1,222 (366)	1,175 (407)	96	0.82	0.80
Manganese, mg	3.4 (1.0)	2.9 (1.1)*	86	0.72	0.72
Potassium, mg	3,046 (894)	2,812 (897)*	92	0.74	0.73
Iodine, µg	111 (44)	107 (49)	96	0.81	0.76
Copper, mg§	1.6 (0.7)	1.4 (0.7)*	89	0.85	0.84
Sodium, mg	2,342 (722)	2,230 (709)	95	0.68	0.67

^$Daily intakes are expressed as mean (SD).

^§Nutrient intakes were transformed (log₁₀) to improve normality.

^*p<0.05 FFQ2 compared to FFQ1 (paired t-test).