Table 4.

Validation of the food frequency questionnaire (FFQ) shown by mean (SD) daily estimates of nutrients and Pearson correlation between crude and energy-adjusted estimations derived from the 7-day dietary record (7-DR) and the FFQ (n=100)

	Daily intake			Pearson correlation coefficient
	7-DR	FFQ	FFQ (% 7-DR)	Crude	Energy-adjusted
Energy, kcal	1,571 (368)$	1,558 (445)	99	0.77	–
Protein, g§	68.5 (15.2)	68.2 (18.5)	100	0.72	0.69
Carbohydrate, g	166 (43)	160 (51)	96	0.76	0.75
Fat, g	64.7 (20.4)	66.2 (23.9)	102	0.75	0.62
MUFA, g§	24.6 (8.9)	26 (10.5)	106	0.78	0.72
PUFA, g§	8.7 (4.5)	9.1 (5.1)	105	0.75	0.58
SFA, g	24.6 (8.7)	24.9 (9.8)	101	0.68	0.60
Cholesterol, mg	247 (90)	249 (106)	101	0.57	0.48
Fiber, g§	14.5 (5.3)	19.1 (7.6)*	132	0.73	0.71
Vitamin A, µg§	366 (462)	386 (455)*	106	0.57	0.19
Thiamine, mg	1 (0.3)	1.1 (0.4)*	110	0.54	0.50
Riboflavin, mg	1.4 (0.5)	1.6 (0.5)*	114	0.71	0.72
Niacin, mg§	14.7 (4.2)	15.5 (4.9)	105	0.57	0.49
Pantothenic acid, mg	4.2 (1.2)	5.1 (1.6)*	121	0.60	0.56
Pyridoxine, mg	1.4 (0.4)	1.7 (0.5)*	121	0.61	0.59
Folic acid, µg	234 (81)	315 (110)*	134	0.59	0.63
Cobalamin, µg§	4.9 (5)	4.5 (2.8)	92	0.80	0.46
Vitamin C, mg§	84.8 (42)	147.7 (69)*	174	0.42	0.56
Vitamin D, µg§	2.5 (1.5)	2.9 (1.8)*	116	0.55	0.50
Vitamin E, mg§	8.8 (5.4)	10.1 (5.2)*	115	0.75	0.57
Calcium, mg	644 (202)	636 (218)	99	0.65	0.65
Iron, mg	9.9 (3)	11.7 (3.6)*	118	0.58	0.51
Magnesium, mg	216 (54)	240 (69)*	111	0.67	0.67
Zinc, mg	7.3 (2.1)	8.5 (2.5)*	116	0.60	0.44
Selenium, µg§	39.8 (18.6)	44.2 (14.2)*	111	0.54	0.50
Phosphorus, mg	1,051 (244)	1,064 (285)	101	0.68	0.60
Manganese, mg	2 (0.8)	2.8 (1.0)*	140	0.56	0.48
Potassium, mg	2,483 (636)	2,702 (811)*	109	0.64	0.64
Iodine, µg	101 (45)	102 (31)	101	0.45	0.55
Copper, mg§	1 (0.5)	1.3 (0.5)*	130	0.36	0.19
Sodium, mg	2,006 (610)	2,057 (765)	103	0.71	0.56

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

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

^*p<0.05 FFQ compared to 7-DR (paired t-test).