Table 3.
Comparison of relative error between the different measurement methods
| Method | Test set | Mean (%) | 95 % CI (%) | sd (%) | Score* |
|---|---|---|---|---|---|
| Computer software | Computer-calculated | −2·8 | −6·8, 1.2 | 20·4 | 85/100 |
| Visual estimation | R1† without parameter | 48·3 | 34·9, 61·6 | 63·8 | 33/90 |
| R1 with parameter | 62·0 | 45·3, 78·8 | 80·0 | 29/90 | |
| R2 without parameter | −4·0 | −17·2, 9·2 | 66·6 | 57/100 | |
| R2 with parameter | −13·5 | −21·5, −5·5 | 40·2 | 48/100 | |
| R3 without parameter | −50·3 | −57·4, −43·2 | 35·6 | 15/100 | |
| R3 with parameter | −34·7 | −44·0, −25·4 | 46·8 | 22/100 |
*Score: (the number of food items with less than 30 % error)/(the total number of estimated foods).
†R1, R2 and R3 represent the three raters, respectively.