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Table 3 Mean(SD) and median(IQ Range) estimates for energy and select nutrient intakes derived from the test data set 1

From: Application and interpretation of multiple statistical tests to evaluate validity of dietary intake assessment methods

Nutrient EER/RDA Test method (g) Reference method (g) Difference (g)
  Males Females Mean (SD) Median (IQ Range) Mean (SD) Median (IQ Range) Mean (SD) 95% CI of difference Median (IQ Range)
Energy (kJ) 12881 10093 12463 (5854) 12475 (7686–17091) 13819 (3677) 13661 (11003–16225) −1356 (6025) −9192 - 8602 −1642 (−6439 - 2830)
Protein (g) 56 46 67.3 (34.0) 66.0 (44.7-91.3) 84.9 (26.2) 81.6 (68.8-99.5) −17.6 (38.5) −75.5-48.0 −19.3 (−42.4 - 4.2)
Fat (g) 118 93 69.5 (46.9) 54.8 (38.3 – 86.5) 83.9 (31.5) 82.8 (62.7-102.5) −14.4 (55.5) −83.3-62.1 −12.8 (−54.0-16.9)
Carbohydrates (g) 130 130 475.7 (222.3) 475.7 (289.1-618.3) 494.1 (148.6) 487.7 (397.3-572.0) −18.5 (215.4) −326.2-325.5 −16.3 (−153.1-140.3)
Folate (mcg) 400 400 558.0 (355.2) 454.0 (331.0-788.0) 419.6 (235.7) 405.8 (247.5-552.7) 138.4 (393.7) −401.6-842.9 108.6 (0.9-305.0)
Vitamin A (mcg) 900 700 192.6 (231.1) 92.0 (51.0-242.0) 346.7 (276.9) 277.0 (171.1-402.4) −154.2 (360.9) −895.2-373.9 −105.2 (−278.8-5.1)
Iron (mg) 8 18 12.1 (7.1) 12.3 (6.5-15.7) 16.1 (5.5) 15.4 (11.4-0.2) −6.0 (8.2) −18.9 – 10.5 −6.2 (−11.1- -1.7)
  1. 1Energy and nutrient intake derived from a QFFQ and four repeated 24-hour recalls conducted in 18–65 year old adults (n = 47, 11 males & 36 females) in a rural area in the Eastern Cape.
  2. RDA: Recommended dietary allowances.
  3. SD = standard deviation, IQ Range = inter quartile range, CI = 95% Confidence interval.