|
FFQ 1
|
Test-retest reproducibility (FFQ 2)
|
P
|
Relative validity (WFR)
|
P
|
---|
Median
|
(P25, P75)
|
Median
|
(P25, P75)
|
Spearman’s r
|
Median
|
(P25, P75)
|
Spearman’s r
|
---|
Energy (kcal/day)
|
2310
|
(1478, 2745)
|
1921
|
(1619, 2796)
|
0.82
|
< 0.001
|
2170
|
(1834, 3042)
|
0.51
|
0.018
|
Energy (kJ/day)
|
9696
|
(6194, 11,519)
|
8086
|
(6795, 11,722)
|
0.82
|
< 0.001
|
9079
|
(7672, 12,801)
|
0.51
|
0.018
|
Fat (g/day)
|
82a
|
(24)
|
71
|
(59, 109)
|
0.71
|
< 0.001
|
93a
|
(26)
|
0.37b
|
0.104
|
Saturated fat (g/day)
|
25
|
(22, 35)
|
25
|
(20, 37)
|
0.77
|
< 0.001
|
34
|
(26, 40)
|
< 0.05
|
0.832
|
Carbohydrates (g/day)
|
261
|
(154, 300)
|
231
|
(177, 302)
|
0.86
|
< 0.001
|
250
|
(175, 386)
|
0.59
|
0.005
|
Fibre (g/day)
|
30
|
(17, 38)
|
29
|
(19, 38)
|
0.85
|
< 0.001
|
33a
|
(13)
|
0.70
|
< 0.001
|
Protein (g/day)
|
92
|
(66, 127)
|
96
|
(69, 119)
|
0.87
|
< 0.001
|
98
|
(71, 110)
|
0.50
|
0.021
|
Alcohol (g/day)
|
2.8
|
(0.3, 7.5)
|
3.8
|
(1.1, 5.1)
|
0.83
|
< 0.001
|
0
|
(0, 6.6)
|
0.71
|
< 0.001
|
Vitamin A (RAE/day)
|
779
|
(349, 979)
|
683
|
(506, 975)
|
0.87
|
< 0.001
|
813
|
(569, 1356)
|
0.72
|
< 0.001
|
Folate (μg/day)
|
312a
|
(135)
|
298
|
(199, 416)
|
0.90
|
< 0.001
|
317
|
(254, 436)
|
0.78
|
< 0.001
|
Vitamin B12 (μg/day)
|
6.1
|
(3.7, 8.4)
|
6.8a
|
(2.8)
|
0.86
|
< 0.001
|
5.2
|
(4.3, 6.6)
|
0.66
|
0.001
|
Calcium (mg/day)
|
811
|
(623, 1197)
|
828
|
(497, 1373)
|
0.93
|
< 0.001
|
1122
|
(774, 1280)
|
0.55
|
0.010
|
Iron (mg/day)
|
12a
|
(4.4)
|
11a
|
(4.1)
|
0.85b
|
< 0.001
|
12
|
(9.8, 17)
|
0.67
|
0.001
|
Iodine (μg/day)
|
126
|
(94, 228)
|
142
|
(95, 221)
|
0.88
|
< 0.001
|
131
|
(97, 161)
|
0.67
|
0.001
|
Vitamin D (μg/day)
|
5.6
|
(3.3, 7.4)
|
5.5
|
(3.3, 7.7)
|
0.56
|
0.008
|
3.9
|
(2.8, 5.6)
|
0.46
|
0.034
|
Salt (g/day)
|
7.7
|
(5.2, 8.9)
|
6.1
|
(5.2, 10)
|
0.85
|
< 0.001
|
6.6
|
(5.6, 9.0)
|
0.21
|
0.363
|
Sugars (g/day)
|
20
|
(16, 27)
|
27
|
(15, 38)
|
0.59
|
0.005
|
31
|
(19, 67)
|
0.62
|
0.003
|
- Energy and nutrient intake for food-frequency questionnaire 1 (FFQ), food-frequency questionnaire 2 and 7-day weighed food record (WFR). Energy and nutrients presented as median (25th percentile, 75th percentile), Spearman’s rank correlation coefficient and p-value. Vitamin A presented as retinol activity equivalents (RAE = sum retinol + 1/12 beta-carotene). Statistically significant p-values marked in bold
- aMean (standard deviation)
- bPearson’s correlation coefficient