Table 2 |
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|
Measures of reproducibility for single questions about consumption frequency in the test and retest food frequency questionnaire (FFQ) |
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|
Agreement, % |
Misclassification, % |
Symmetry of misclassification, % |
Kappa |
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|
|
|
|
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|
Food item (response options) |
n |
Total |
Never/rarelya |
± 1 Categ.b |
± 2 Categ.b |
Extr.c |
Retest<Test |
Retest>Test |
Difference |
Simple |
Weighted |
|
|
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|
Potatoes (7) |
1452 |
62 |
1 |
25 |
9 |
0.0 |
21 |
17 |
4 |
0.48 |
0.61 |
|
Carrots (7) |
1406 |
43 |
1 |
42 |
11 |
0.0 |
35 |
22 |
13 |
0.30 |
0.54 |
|
Salad (7) |
1169 |
41 |
3 |
41 |
12 |
0.0 |
22 |
37 |
-15 |
0.28 |
0.52 |
|
Swede (7) |
1134 |
49 |
7 |
38 |
8 |
0.0 |
31 |
20 |
11 |
0.32 |
0.52 |
|
"Other vegetables" (7) |
865 |
34 |
8 |
35 |
18 |
0.5 |
34 |
32 |
2 |
0.20 |
0.37 |
|
Oranges (7) |
1107 |
39 |
5 |
34 |
20 |
0.1 |
50 |
12 |
38 |
0.25 |
0.47 |
|
"Other fruits" (7) |
978 |
39 |
4 |
34 |
17 |
0.2 |
29 |
33 |
-4 |
0.25 |
0.42 |
|
Whole milk (6) |
710 |
85 |
78 |
11 |
3 |
0.1 |
8 |
6 |
2 |
0.52 |
0.61 |
|
Meat, reindeer (6) |
1339 |
86 |
75 |
11 |
1 |
0.6 |
8 |
6 |
2 |
0.58 |
0.57 |
|
Roast (beef, pork, lamb) (5) |
1280 |
54 |
13 |
37 |
7 |
0.1 |
26 |
20 |
6 |
0.33 |
0.42 |
|
Meat, chops (5) |
1301 |
62 |
10 |
35 |
4 |
0.0 |
15 |
24 |
-9 |
0.42 |
0.52 |
|
"Other meat dishes" (5) |
921 |
40 |
11 |
41 |
15 |
0.2 |
31 |
28 |
3 |
0.21 |
0.32 |
|
Cod/coalfish/haddock/pollack (6) |
1362 |
48 |
2 |
41 |
9 |
0.0 |
29 |
22 |
7 |
0.32 |
0.51 |
|
Salmon/trout (6) |
1225 |
53 |
5 |
39 |
7 |
0.0 |
22 |
25 |
-3 |
0.35 |
0.48 |
|
Fish liver (5) |
1229 |
78 |
43 |
18 |
3 |
0.2 |
12 |
10 |
2 |
0.68 |
0.77 |
|
Shellfish (4) |
1374 |
70 |
35 |
27 |
2 |
0.1 |
13 |
17 |
-4 |
0.54 |
0.62 |
|
Beer (7) |
1005 |
63 |
41 |
29 |
6 |
0.0 |
14 |
23 |
-9 |
0.46 |
0.61 |
|
Wine (7) |
1137 |
46 |
13 |
40 |
13 |
0.0 |
19 |
35 |
-16 |
0.34 |
0.60 |
|
Chocolate (6) |
1402 |
57 |
18 |
35 |
6 |
0.0 |
26 |
17 |
9 |
0.42 |
0.57 |
|
Cod liver oil capsules, winter (5) |
156 |
76 |
3 |
13 |
3 |
5.1 |
9 |
15 |
-6 |
0.33 |
0.45 |
|
Cod liver oil capsules, rest of year (5) |
130 |
69 |
15 |
12 |
4 |
11.5 |
15 |
16 |
-1 |
0.44 |
0.53 |
|
|
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aLowest response category in the FFQ, bCategories: ± 1 or ± 2 from the line of agreement in the contingency table cExtremes: test-retest responses in the lowest and highest categories |
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|
Parr et al. Nutrition Journal 2006 5:4 doi:10.1186/1475-2891-5-4 |
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