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Table 4 Spearman correlation coefficients, percentage of agreement and weighted kappa (κ) statistic of daily intake of nutrients and food between FFQ1 and DRs

From: Reproducibility and relative validity of a food frequency questionnaire for a diet-related study in a rural Chinese population

  Spearman correlation coefficients Percentage of agreement (%) κa d
crude b Energy adjusted c Same tertile Adjacent tertile Extreme tertile
Energy 0.55 50.75 45.35 3.90 0.36
Protein 0.44 0.43 50.75 40.16 9.09 0.30
Fat 0.45 0.41 50.40 41.16 8.44 0.31
Fiber 0.58 0.54 53.90 39.61 6.49 0.41
Carbohydrate 0.45 0.45 50.40 41.16 8.44 0.31
Carotene 0.54 0.54 51.30 40.26 8.44 0.36
Retinol 0.45 0.45 50.51 41.05 8.44 0.30
Thiamine 0.40 0.53 53.21 39.05 7.74 0.34
Riboflavin 0.39 0.39 48.10 42.81 9.09 0.29
Niacin 0.45 0.41 50.65 42.86 6.49 0.37
Vitamin C 0.51 0.50 53.90 37.66 8.44 0.38
Vitamin E 0.65 0.50 59.09 36.36 4.55 0.49
Calcium 0.57 0.50 53.90 38.96 7.14 0.40
Iron 0.43 0.68 50.75 39.86 9.39 0.28
Zinc 0.40 0.47 47.40 44.16 8.44 0.31
Selenium 0.43 0.39 48.05 42.86 9.09 0.31
Eggs 0.46 0.44 52.40 41.75 5.84 0.34
Red meat 0.40 0.42 51.21 39.75 9.04 0.32
White meat 0.25 0.21 49.35 39.61 11.04 0.21
Soy products 0.61 0.48 58.73 31.75 9.52 0.36
Fresh vegetables 0.49 0.46 53.90 37.66 8.44 0.38
Processed vegetables 0.42 0.40 51.01 39.45 9.53 0.31
Fruits 0.66 0.62 53.25 40.26 6.49 0.41
Nuts and seeds 0.44 0.41 45.45 40.26 14.29 0.22
Cereals 0.56 0.61 55.84 40.91 3.25 0.47
Tuber crop 0.46 0.49 50.51 39.66 9.83 0.32
  1. aAbbreviation: FFQ1, the first pass of food frequency questionnaire, DRs, two 3-day dietary recalls; κ, statistic for weighted kappa test;
  2. bAll crude coefficients were significant (P < 0.05) except for white meat
  3. cAll adjusted coefficients were significant (P < 0.05) except for white meat
  4. dAll weighted Kappa values were significant (P < 0.05) except for white meat and riboflavin