From: Validation of a newly automated web-based 24-hour dietary recall using fully controlled feeding studies
Kappa score
Correlation coefficient (P)
Estimation bias (estimation error)a
All portions
N = 1373
0.62
0.80*
3.2 g (9.2%)
Small portions (<100 g)
N = 640
0.43
0.46*
7.6 g* (17.1%)
Large portions (≥100 g)
N = 733
0.50
0.68*
−0.6 g (−2.4%)