Relative validity of a dietary interview for assessing infant diet and compliance in a dietary intervention trial.
The objective of this study was to assess the relative validity of a dietary interview method for use in an infant population. A dietary interview covering a 1-month period was completed during a study visit at 3 or 6 months of age. It included structured questions and a short food frequency questionnaire (FFQ). The information was compared with data from two 48-h recall interviews conducted during the month previous to the study visit. The agreement between the FFQ and 48-h recalls was analysed as proportion of subjects classified into the same categories of consumption frequency and by the kappa analysis. A total of 100 subjects, at the age of 2-3 months (n = 50) and 5-6 months (n = 50), were included. The kappa values for breastmilk and study formula ranged from 0.82 to 0.95, indicating very good agreement. The agreement for other foods and vitamin D supplementation ranged from fair to very good. We also found a strong correlation for the reported amount of study formula consumed per feeding at 3 months (r(s) = 0.87, n = 24) and 6 months of age (r(s) = 0.73, n = 35) between the questionnaire and 48-h recall data. However, the average amount of study formula per feeding was significantly higher when estimated for a 1-month period, compared with a mean calculated from the two 48-h recalls. As a conclusion, the interview was found to be a useful tool for assessing diet and compliance in a dietary intervention for infants.
Vähätalo
Liisa
L
Nutrition Unit, Department of Health Promotion and Chronic Disease Prevention, National Public Health Institute, Mannerhemintie 166, FI-00300 Helsinki, Finland.
Bärlund
Sonja
S
Hannila
Marja-Leena
ML
Uusitalo
Ulla
U
Pigg
Hanna-Mari
HM
Salonen
Marja
M
Nucci
Anita
A
Krischer
Jeffrey P
JP
Knip
Mikael
M
Akerblom
Hans K
HK
Virtanen
Suvi M
SM
D000328:Adult; D001942:Breast Feeding / Q000706:statistics & numerical data; D004032:Diet; D005260:Female; D006801:Humans; D007223:Infant; D007225:Infant Food / Q000706:statistics & numerical data*; D041943:Infant Formula / Q000008:administration & dosage / Q000706:statistics & numerical data; D007227:Infant Nutritional Physiological Phenomena; D007407:Interviews as Topic / Q000592:standards*; D008297:Male; D011939:Mental Recall; D008875:Middle Aged; D015596:Nutrition Assessment; D010349:Patient Compliance; D011795:Surveys and Questionnaires