Table 2

Amount of food estimated by FP 24-hR and compared with amount weighed in WFR
FOOD CATEGORY (n) FP 24-hR WR   Spermanr Median difference FP24hR – WFRa Bland Altman Analysis FP24hR – WFR (antilog)b
Median (P25, P75) Median (P25, P75) Median (P25, P75) % Geometric mean ratio 95% Limits of agreement
Bread [g] 26 55 (50, 60) 55 (47, 65) 0.81 -1.5 (-4.3,3.0) -2.43 0.98 0.79 1.22
Rice [g] 43 165 (105, 200) 165 (108, 237) 0.95 -13.0 (-30.0, 5.0) -6.76 0.93 0.71 1.20
Noodles [g] 43 175 (154, 256) 187 (150, 263) 0.93 -12.0 (-20.0, 9.0) -5.41 0.97 0.73 1.28
Potatoes [g] 80 114 (61, 160) 115 (71, 168) 0.98 -5.0 (-10.0, 7.8) -5.80 0.96 0.79 1.18
Cassava [g] 19 117 (64, 156) 108 (66, 143) 0.98 -1.0 (-8.0, 8.0) -2.33 0.99 0.80 1.22
Meat [g] 48 36 (25, 51) 34 (26,49) 0.96 -2.0 (-4.0, 2.0) -4.88 0.95 0.71 1.28
Egg [g] 15 50(50, 50) 54 (46, 57) 0.75 -3.0 (-7.0, -1.0) -6.54 0.94 0.76 1.17
Vegetables [g] 198 25 (13, 43) 25 (14, 43) 0.96 -1.0 (-4.0, 2.0) -5.44 0.98 0.65 1.43
Leafy vegetables [g] 17 25 (25, 50) 27 (20, 46) 0.90 2.0 (-5.0, 7.0) 8.70 1.09 0.70 1.69
Beverages [g] 19 250 (200, 325) 260 (210, 310) 0.95 4.0 (-10.0, 10.0) 1.63 1.01 0.93 1.10

a Median difference between FP 24-hR and WFR, in grams with 25th, 75th percentiles for the difference of each food category, and median of percentage percentage of the difference in parenthesis (calculated as: % of the difference = ((amount from FP 24hR- amount from WFR) / mean amount from WFR)*100).

b Bland Altman analysis, show the antilog values of the mean difference between FP 24-hR and WFR, represented as the geometric mean ratio of amounts estimated by the FP 24-hR and weighed by WFR, and the 95% limits of agreement, represent the range of proportional agreement between both methods.

Lazarte et al.

Lazarte et al. Nutrition Journal 2012 11:61   doi:10.1186/1475-2891-11-61

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