Table 3.

Correlations of daily energy and nutrient intakes when comparing the FFQ to the average of two 24-h dietary recalls

Macronutrients	Pearson's correlation (95 % CI)			Bland–Altman statistics
		Energy adjusted correlation (95 % CI)	De-attenuated correlation	Mean difference (95 % CI)		95 % limit of agreement
Energy (kcal)	0⋅24* (0⋅05,0⋅41)	–	0⋅38	367⋅6 (259⋅0, 476⋅1)*		−731⋅9, 1467⋅1
Protein (g)	0⋅22* (0⋅03, 0⋅36)	0⋅20* (0⋅006, 0⋅375)	0⋅36	10⋅5 (7⋅6, 13⋅5)*		−19⋅7, 40⋅8
Total fat (g)	0⋅05 (−0⋅14, 0⋅24)	0⋅26* (0⋅076, 0⋅433	0⋅10	4⋅4 (2⋅5, 5⋅7)*		−13⋅7, 22⋅5
Carbohydrate (g)	0⋅32* (0⋅14, 0⋅48)	0⋅51* (0⋅36 to 0⋅64)	0⋅51	77⋅6 (54⋅5, 100⋅6)*		−155⋅9, 311
Micronutrients	Spearman's correlation (95 % CI)	Energy adjusted correlation (95 % CI)	De-attenuated correlation	Bland and Altman statistics for log-transformed data
				Mean difference (95 % CI)	95 % limit of agreement
Calcium (mg)	0⋅10 (−0⋅09, 0⋅29)	0⋅12 (−0⋅06 to 0⋅32)	0⋅20	0⋅15 (0⋅11, 0⋅18)*	−0⋅26, 0⋅55
Iron (mg)	0⋅12 (−0⋅07, 0⋅30)	0⋅12 (−0⋅07 to 0⋅31)	0⋅23	0⋅06 (0⋅007, 0⋅11)*	−0⋅45, 0⋅61
Vitamin A (μg RAE)	0⋅45* (0⋅28, 0⋅59)	0⋅37* (0⋅19 to 0⋅52)	0⋅80	0⋅5 (0⋅34, 0⋅66)*	−1⋅1, 2⋅1
Vitamin B1 (mg)	0⋅49* (0⋅33, 0⋅62)	0⋅39* (0⋅22 to 0⋅54)	0⋅75	0⋅1 (0⋅02, 0⋅11)*	−0⋅4, 0⋅5
Vitamin B2 (mg)	0⋅17 (−0⋅02, 0⋅35)	0⋅07 (−0⋅12 to 0⋅26)	0⋅35	0⋅05 (0⋅01, 0⋅09)*	−0⋅41, 0⋅51

CI, Confidence interval.

^*P ≤ 0⋅05.