Figure 5.

Bland Altman plots for estimated and weighed food amount. Differences between the log amounts of food portions estimated and weighed against their mean values, the solid line represents the average difference between the log estimated and the log weighed food amount; the dotted lines show the 95% log limits of agreement which, when calculating the antilog, represent the range of proportional agreement between both methods. a) Plot for noodles amount, b) Plot for potatoes, c) Plot for meat and d) Plot for vegetables. Plots show not systematic bias and that the range of proportional agreement is narrow enough to be confident using the photo method.