Tables - South African Health Information

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Nutrient intake: Quantitative food frequency questionnaire381____________________________________________________________________________________________________________________________Table 6.2Pearson correlation coefficient between the nutrient intake as obtained from the 24-H-Rand QFFQVariable Pearson r p-valueEnergy 0.4 0.0001Protein 0.4 0.0001Fat 0.43 0.0001Carbohydrate 0.36 0.0001Calcium 0.38 0.0001Iron 0.4 0.0001Vitamin A 0.06 0.5Vitamin C 0.45 0.0001Thiamin 0.38 0.0001Niacin 0.34 0.0001Riboflavin 0.27 0.002
Nutrient intake: Quantitative food frequency questionnaire382____________________________________________________________________________________________________________________________Table 6.3Bland-Altman Method: Complete data set of nutrient intake as obtained from the 24-H-Rand the QFFQ (n = 127)VariableLimits of agreementa Lower b Upperc Spearman rd P-valuee sd/smEnergy (kJ) -6448 10648 0.65 0.0000 1.54Protein (g) -70 102 0.55 0.0000 1.60Fat (g) -56 84 0.53 0.0000 1.40Carbohydrate (g) -205 347 0.56 0.0000 1.53Calcium (mg) -557 807 0.35 0.0001 1.42Iron (mg) -11 17 0.41 0.0000 1.40Vitamin A (RE) -2411 2661 0.38 0.00001 1.90Vitamin C (mg) -494 606 0.46 0.0000 1.72Thiamin (mg) -0.75 15 0.51 0.0000 1.50Niacin (mg) -17 23 0.33 0.0002 1.67Riboflavin (mg) -1.8 2.6 0.43 0.0000 1.71a. Lower limit = mean of QFFQ and 24-H-R - 2 standard deviationsb. Upper limit = mean of QFFQ and 24-H-R + 2 standard deviationsc. Spearman correlation between the mean of the QFFQ and 24-H-R and the difference between the QFFQ and 24-H-Rd. Significance of the Spearman correlatione. Standard deviation of the difference/standard deviation of the mean
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Tables - South African Health Information

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