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Table 8 Mean correlation coefficients for variables, by category

From: Test-retest reliability of a new questionnaire on the diet and eating behavior of one year old children

Variable category (number of questions) Mean Spearman’s r SD Mean Cohen’s kappa 1 SD
Non-numeric variables2 (14)    0.75 0.21
Scale variables3 (7) 0.86 0.10 0.74 0.12
Food frequency, all items (63) 0.72 0.17 0.59 0.18
Beverages (17) 0.75 0.20 0.64 0.23
Breakfast/lunch foods (18) 0.70 0.13 0.51 0.13
Dinner foods (15) 0.65 0.13 0.59 0.11
Desserts/snacks (9) 0.75 0.21 0.68 0.22
Supplements (4) 0.90 0.05 0.76 0.10
Meal pattern4 (13) 0.58 0.15 0.44 0.11
  1. 1Scale and frequency variables were ranked into quartile categories for calculating Cohen’s kappa. 2breastfeeding status, reasons for breastfeeding cessation, whether the child feeds her/himself and how the child drinks liquids. 3age in months at weaning from breast, introduction of other milks and complementary foods; relative frequency of reading labels on food. 4weekly frequencies of foods, daily meals, meals eaten together with at least one parent, and meals out. SD included to show central tendency. All correlation measures significant at p ≤ 0.001.
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