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Table 5 FFQ reproducibility: Pearson correlation coefficients and intra-class correlation coefficients (ICC) for nutrient intake as reported in FFQt1 and FFQt2 in Moroccan adults

From: Adaptation and validation of a food frequency questionnaire (FFQ) to assess dietary intake in Moroccan adults

Nutrients Pearson correlation coefficient Intra-class correlation coefficient
Unadjusted Energy-adjusted Unadjusted Energy-adjusted
Energy (kcal) 0.73** 0.84**
Carbohydrates(g) 0.62** 0.56** 0.76** 0.72**
Proteins (g) 0.68** 0.60** 0.81** 0.75**
Fat (g) 0.69** 0.53** 0.81** 0.69**
Total MUFA(g) 0.71** 0.61** 0.82** 0.76**
Total PUFA(g) 0.70** 0.61** 0.83* 0.76**
Total SFA(g) 0.73* 0.64** 0.84** 0.78**
Vitamin A (μg) 0.76** 0.73** 0.86** 0.84**
Vitamin C (mg) 0.75** 0.67** 0.86** 0.80**
Vitamin E (mg) 0.71** 0.60** 0.83** 0.75**
Selenium (μg) 0.66** 0.60** 0.80** 0.75**
Magnesium (mg) 0.64** 0.59** 0.78** 0.74**
Calcium (mg) 0.69** 0.64** 0.81** 0.78**
Iron (mg) 0.71** 0.66** 0.83** 0.80**
Fiber (g) 0.72** 0.65** 0.84** 0.79**
  1. *Energy and nutrients were transformed (log10) to improve normality; **p ≤ 0.001