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Table 1 Pearson's correlation coefficient between the first and second FFQs for all subjects

From: Reproducibility and validity of the food frequency questionnaire for estimating habitual dietary intake in children and adolescents

Nutrients CFFQ AFFQ
  n = 89 n = 89
Energy (kcal/day) 0.73** 0.80**
Protein (g/day) 0.77** 0.73**
Total fat (g/day) 0.76** 0.71**
Carbohydrate (g/day) 0.67** 0.83**
Sodium (mg/day) 0.76** 0.75**
Potassium (mg/day) 0.77** 0.72**
Calcium (mg/day) 0.78** 0.78**
Magnesium (mg/day) 0.77** 0.79**
Phosphorous (mg/day) 0.79** 0.77**
Iron (mg/day) 0.74** 0.67**
Zinc (mg/day) 0.79** 0.76**
Copper (mg/day) 0.69** 0.75**
Manganese (mg/day) 0.72** 0.39**
Vitamin A (μgRE/day) 0.72** 0.72**
Vitamin D (mcg/day) 0.74** 0.65**
Alpha tocopherol (mg/day) 0.76** 0.73**
Vitamin K (mg/day) 0.82** 0.68**
Vitamins B1 (mg/day) 0.80** 0.78**
Vitamins B2 (mg/day) 0.82** 0.77**
Niacin (mg/day) 0.80** 0.77**
Vitamin B6 (mg/day) 0.82** 0.77**
Vitamin B12 (μg/day) 0.76** 0.71**
Folic acid (μg/day) 0.81** 0.67**
Pantothenic acid (mg/day) 0.84** 0.79**
Vitamins C (mg/day) 0.72** 0.61**
Cholesterol (mg/day) 0.80** 0.67**
Dietary fiber (g/day) 0.78** 0.77**
Saturated fatty acid (g/day) 0.81** 0.80**
Monounsaturated fatty acid (g/day) 0.78** 0.74**
Polyunsaturated fatty acid (g/day) 0.78** 0.72**
n-3 polyunsaturated fatty acid (mg/day) 0.56** 0.72**
n-6 polyunsaturated fatty acid (mg/day) 0.55** 0.71**
Myristic acid (mg/day) 0.71** 0.82**
Oleic acid (mg/day) 0.57** 0.74**
Linoleic acid (mg/day) 0.54** 0.71**
Alpha-linolenic acid (mg/day) 0.58** 0.70**
Arachidonic acid (mg/day) 0.61** 0.68**
Icosapentaenoic acid (mg/day) 0.56** 0.63**
Docosahexaenoic acid (mg/day) 0.55** 0.65**
  1. ‡: The data (Alpha tocopherol, Vitamin K, Vitamins B1, B2, Niacin, B6, and B12) were transformed by natural log to improve normality
  2. CFFQ: Food frequency questionnaire for dietary assessment in children
  3. AFFQ: Food frequency questionnaire for dietary assessment in adults
  4. **: p < 0.01