Table 3 |
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|
Measures of reproducibility for the intake of food groups (g/day) in the test and retest food frequency questionnaire (FFQ), n = 1370 |
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| Test (FFQ1) |
Retest (FFQ2) |
Within person differences (FFQ1-FFQ2) |
Pearson |
Spearman |
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|
|
|
|
|
|
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| Food group (no. items) |
Mean |
SDa |
Mean |
SD |
Mean |
95% CIb |
Mean ± 2 SDc |
r |
95% CI |
rs |
|
|
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| Potatoes (1) |
107 |
56 |
103 |
57 |
3.4 |
(1.2, 5.7) |
(-80, 87) |
0.72 |
(0.69, 0.75) |
0.70 |
| Vegetables (7) |
118 |
75 |
116 |
71 |
1.3 |
(-1.7, 4.4) |
(-112, 115) |
0.69 |
(0.66, 0.72) |
0.71 |
| Fruits (5) |
200 |
127 |
185 |
130 |
15.4 |
(10.0, 20.8) |
(-185, 216) |
0.68 |
(0.65, 0.71) |
0.71 |
| Dairy products (12) |
207 |
161 |
203 |
159 |
3.3 |
(-4.0, 10.6) |
(-266, 273) |
0.63 |
(0.60, 0.66) |
0.76 |
| Drinking milk, yogurt, cheese on bread (9) |
181 |
158 |
179 |
154 |
2.4 |
(-4.8, 9.7) |
(-264, 269) |
0.62 |
(0.58, 0.65) |
0.74 |
| Cream desserts, milk based puddings (3) |
25 |
25 |
25 |
26 |
0.8 |
(-0.2, 1.8) |
(-36, 38) |
0.72 |
(0.70, 0.75) |
0.80 |
| Cereal and cereal products (7) |
161 |
65 |
154 |
63 |
7.0 |
(3.8, 10.2) |
(-112, 126) |
0.55 |
(0.52, 0.59) |
0.55 |
| Bread, crisp bread, breakfast cereal (5) |
131 |
61 |
124 |
57 |
6.3 |
(3.3, 9.3) |
(-103, 116) |
0.55 |
(0.52, 0.59) |
0.55 |
| Pasta and rice (2) |
30 |
23 |
30 |
22 |
0.7 |
(-0.2, 1.7) |
(-36, 37) |
0.66 |
(0.63, 0.69) |
0.68 |
| Meat and meat products (11) |
96 |
46 |
95 |
45 |
0.2 |
(-2.0, 2.4) |
(-81, 81) |
0.59 |
(0.55, 0.62) |
0.58 |
| Read meat and chicken (5) |
28 |
17 |
29 |
17 |
-1.1 |
(-1.9, -0.3) |
(-31, 29) |
0.62 |
(0.58, 0.65) |
0.63 |
| Processed meat (6) |
68 |
37 |
67 |
37 |
1.3 |
(-0.6, 3.1) |
(-66, 69) |
0.57 |
(0.53, 0.60) |
0.56 |
| Fish and shellfish (17) |
128 |
77 |
123 |
73 |
5.1 |
(1.9, 8.4) |
(-116, 127) |
0.66 |
(0.63, 0.69) |
0.69 |
| Whole fish (filets, steaks) and shellfish (8) |
81 |
60 |
77 |
59 |
4.2 |
(1.4, 7.1) |
(-100, 108) |
0.60 |
(0.57, 0.63) |
0.66 |
| Fish products (9) |
47 |
30 |
46 |
28 |
0.9 |
(-0.5, 2.3) |
(-51, 53) |
0.58 |
(0.54, 0.61) |
0.59 |
| Eggs (1) |
14 |
11 |
14 |
11 |
-0.7 |
(-1.1, -0.2) |
(-16, 15) |
0.72 |
(0.69, 0.74) |
0.70 |
| Fat (margarine, butter) on bread (7) |
12 |
13 |
11 |
11 |
0.8 |
(0.3, 1.2) |
(-17, 18) |
0.72 |
(0.70, 0.75) |
0.78 |
| Cakes (6) |
35 |
26 |
36 |
27 |
-0.3 |
(-1.5, 0.9) |
(-44, 43) |
0.65 |
(0.62, 0.68) |
0.65 |
| Orange juice, soft drinks, diluted syrups (3) |
106 |
121 |
112 |
130 |
-6.6 |
(-12.1, -1.0) |
(-211, 198) |
0.66 |
(0.62, 0.68) |
0.70 |
| Coffee (boiled, filtered, instant) (3) |
368 |
249 |
366 |
258 |
1.5 |
(-9.3, 12.4) |
(-400, 403) |
0.67 |
(0.64, 0.70) |
0.73 |
| Alcoholic beverages (wine, beer, spirits) (3) |
32 |
51 |
41 |
60 |
-9.1 |
(-11.5, -6.7) |
(-98, 80) |
0.68 |
(0.65, 0.71) |
0.76 |
| Condiments and sauces for fish (5) |
9 |
9 |
9 |
9 |
0.3 |
(-0.2, 0.8) |
(-18, 18) |
0.50 |
(0.46, 0.54) |
0.58 |
| Sweets and salty snacks (6) |
25 |
19 |
25 |
19 |
0.1 |
(-0.8, 0.9) |
(-31, 31) |
0.66 |
(0.63, 0.69) |
0.71 |
| Cod liver oil supplements (4) |
2 |
3 |
2 |
3 |
-0.1 |
(-0.2, 0.0) |
(-4, 4) |
0.79 |
(0.77, 0.81) |
0.74 |
|
|
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|
aSD = Standard deviation, bCI = Confidence interval, cReferred to as "limits of agreement" in the text |
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|
Parr et al. Nutrition Journal 2006 5:4 doi:10.1186/1475-2891-5-4 |
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