Skip to main content

Table 4 Validation tests comparing dietary choline intake between the semiquantitative food frequency questionnaire and 24-hour recall interviews

From: Development and validation of a quantitative choline food frequency questionnaire for use with drinking and non-drinking pregnant women in Cape Town, South Africa

 

Group-level agreement

Individual-level agreement

Summary

Agreement

Agreement

Agreement

Bias

Strength of association

Agreement including chance

Agreement excluding chance

Wilcoxon signed rank test p

Percentage difference

Bland-Altman LOA index

Bland-Altman Spearman correlation p

Spearman correlation2

Tertile classification

Kappa statistic

Group-level tests at “Good” or “Acceptable” (of 4 tests)

Individual-level tests at “Good” or “Acceptable” (of 5 tests)

Same tertile

Opposite tertile

Weighted for tertiles

Above vs. below AI

Heavy drinkers:

 Visit 1 (n = 121)

.258

M 30.8%

5.0%

.11

.39

48.8%

14.9%

.26

.21

3

3

 Interpretation1

Good

Poor

Good

Good

Acceptable

Poor

Poor

Acceptable

Acceptable

  

 Visits 1-2 (mean) (n = 116)

.976

M 16.6%

8.0%

.552

.39

46.6%

10.3%

.31

.20

3

3

 Interpretation1

Good

Acceptable

Poor

Good

Acceptable

Poor

Poor

Acceptable

Acceptable

  

 Visits 1-3 (mean) (n = 78)

1.00

M -9.5%

5.1%

.148

.43

47.4%

7.7%

.40

.18

4

2

 Interpretation1

Good

Good

Good

Good

Acceptable

Poor

Poor

Acceptable

Poor

  

Abstainers/light-drinkers:

 Visit 1 (n = 83)

.440

M 7.2%

4.8%

.04 (.23)

.51

50.6%

9.9%

.39

.35

4

5

 Interpretation1

Good

Good

Good

Poor

Good

Good

Good

Acceptable

Good

  

 Visits 1-2 (mean) (n = 68)

.366

M 0.0%

4.2%

.269

.52

50.0%

8.8%

.42

.35

4

5

 Interpretation1

Good

Good

Good

Good

Good

Good

Good

Acceptable

Acceptable

  

 Visits 1-3 (mean) (n = 42)

1.00

M 5.2%

2.4%

.171

.56

45.0%

10.0%

.33

.63

4

4

 Interpretation1

Good

Good

Good

Good

Good

Poor

Good

Acceptable

Good

  
  1. 1Interpretation criteria [37]:
  2. Wilcoxon signed rank test: Good: p > 0.05; Poor: p ≤ 0.05
  3. Percentage difference: Good: 0.0 – < 11%; Acceptable: 11 - 20.0%; Poor: > 20%
  4. Bland-Altman LOA index (% outside of limit of agreement): Good: ≤ 5%; Poor: > 5%
  5. Bland-Altman Spearman correlation coefficient: Good: p > 0.05; Poor: p ≤ 0.05
  6. Spearman correlation coefficient: Good: ≥ 0.50; Acceptable: 0.20 – 0.49; Poor < 0.20
  7. Tertile classification (% in same tertile): Good: ≥ 50%; Poor: < 50%
  8. Tertile classification (% in opposite tertile): Good: ≤ 10%, Poor: > 10%
  9. Weighted Kappa statistic: Good: ≥ 0.60; Acceptable: 0.20 – 0.59; Poor: < 0.20
  10. 2p < .001 for all Spearman values
Back to article page

Nutrition Journal

ISSN: 1475-2891

Contact us