TY - JOUR
T1 - Relative validity of the pre-coded food diary used in the Danish National Survey of Diet and Physical Activity
AU - Knudsen, Vibeke Kildegaard
AU - Gille, Maj-Britt
AU - Nielsen, Trine Holmgaard
AU - Christensen, Tue
AU - Fagt, Sisse
AU - Biltoft-Jensen, Anja Pia
PY - 2011
Y1 - 2011
N2 - Objective: To determine the relative validity of the pre-coded food diary applied
in the Danish National Survey of Dietary Habits and Physical Activity.
Design: A cross-over study among seventy-two adults (aged 20 to 69 years)
recording diet by means of a pre-coded food diary over 4 d and a 4 d weighed
food record. Intakes of foods and drinks were estimated, and nutrient intakes
were calculated. Means and medians of intake were compared, and crossclassification
of individuals according to intake was performed. To assess
agreement between the two methods, Pearson and Spearman’s correlation
coefficients and weighted kappa coefficients were calculated.
Setting: Validation study of the pre-coded food diary against a 4 d weighed food
record.
Subjects: Seventy-two volunteer, healthy free-living adults (thirty-five males,
thirty-seven females).
Results: Intakes of cereals and vegetables were higher, and intakes of fruit, coffee
and tea were lower, in the weighed food record compared with the food diary.
Intakes of nutrients were grossly the same in the two methods, except for protein,
where a higher intake was recorded in the weighed record. In general, moderate
agreement between the two methods was found.
Conclusions: Participants were classified moderately correct according to food
and nutrient intakes assessed in the pre-coded food diary; however values of
absolute food intakes should be used and interpreted with caution. Improvement
of the methods to estimate portion size may increase the accuracy of the dietary
intake estimates.
AB - Objective: To determine the relative validity of the pre-coded food diary applied
in the Danish National Survey of Dietary Habits and Physical Activity.
Design: A cross-over study among seventy-two adults (aged 20 to 69 years)
recording diet by means of a pre-coded food diary over 4 d and a 4 d weighed
food record. Intakes of foods and drinks were estimated, and nutrient intakes
were calculated. Means and medians of intake were compared, and crossclassification
of individuals according to intake was performed. To assess
agreement between the two methods, Pearson and Spearman’s correlation
coefficients and weighted kappa coefficients were calculated.
Setting: Validation study of the pre-coded food diary against a 4 d weighed food
record.
Subjects: Seventy-two volunteer, healthy free-living adults (thirty-five males,
thirty-seven females).
Results: Intakes of cereals and vegetables were higher, and intakes of fruit, coffee
and tea were lower, in the weighed food record compared with the food diary.
Intakes of nutrients were grossly the same in the two methods, except for protein,
where a higher intake was recorded in the weighed record. In general, moderate
agreement between the two methods was found.
Conclusions: Participants were classified moderately correct according to food
and nutrient intakes assessed in the pre-coded food diary; however values of
absolute food intakes should be used and interpreted with caution. Improvement
of the methods to estimate portion size may increase the accuracy of the dietary
intake estimates.
U2 - 10.1017/S1368980011001650
DO - 10.1017/S1368980011001650
M3 - Journal article
SN - 1368-9800
VL - 14
SP - 2110
EP - 2116
JO - Public Health Nutrition
JF - Public Health Nutrition
IS - 12
ER -