Dietary Intake Clinical Trial
Official title:
Reproducibility and Relative Validity of a Semi-quantitative Food Frequency Questionnaire for Chinese Pregnant Women in Hong Kong
The present study aims to evaluate the reproducibility and relative validity of a
semi-quantitative food frequency questionnaire (FFQ) to assess food group consumption and
nutrient intake for Chinese pregnant women in Hong Kong.
A total of 100 apparently healthy pregnant women aged 18 or above and with gestational age of
at least 5 weeks willl be recruited from the antenatal clinic of the Prince of Wales
Hospital. The research staff will check for eligible subjects, explain study details and
invite them to join the study. Written consent will be obtained from all subjects. Various
maternal data will be collected using standardized methods and questionnaires, and retrieved
from the hospital record.
Each participant will be asked to complete the FFQ twice within 3 to 4 weeks interval (for
reproducibility evaluation), and three 24-hour food recalls in between the two
administrations of the FFQ as a reference method to validate the FFQ (for validity
evaluation). The three 24-hour food recalls will include two weekdays and one weekend day. On
the interview day in which the 1st FFQ is administrated (FFQ1), each participant will be
explained by trained research staff on how to complete the FFQ by herself with the provision
of the food portion booklet. Each participant will be asked to complete the 1st FFQ regarding
her intake of various food groups over the past month. The frequency of food group intake
will be reported per day, week or month, and portions will be reported based on standard
referent portion sizes, as pieces, glasses, cups, spoons, centilitres or grams. Data on use
of supplements will be collected by asking subjects to specify the brand, the frequency, and
the dosage of supplements used. On the same interview day, participant will also be asked by
trained research staff to recall all foods and beverages that have been consumed over the
past 24 hours. Food photo albums and eating utensils of standardized portions will be
displayed to help recall. The 2nd administration of the FFQ (FFQ2) will be done 3 to 4 weeks
after the 1st administration of the FFQ. The FFQ2 and the food portion booklet as well as the
additional 24-hour recall forms will be given to the participants by email or post within 3
to 4 weeks after the 1st administration of the FFQ (FFQ1). Between the intervals of two FFQs,
the research staff will give phone call to the participant on two separate days to complete
two more 24-hour food recalls for validity evaluation purpose. Daily dietary and nutrient
intake collected by both FFQs and 24-hour recalls will be entered and calculated using the
nutrition analysis software Food Processor Nutrition analysis and Fitness software version
8.0 (ESHA Research, Salem, USA) including local foods selected from food composition tables
from China and Hong Kong.
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