People with special eating habits in the Netherlands 2012-2014, by gender and age

* Boys and girls, 1-3 years: 362 respondents
Boys and girls, 4-8 years: 296 respondents
Boys, 9-18 years: 259 respondents
Girls, 9-18 years: 273 respondents
Men, 19-50 years: 273 respondents
Women, 19-50 years: 259 respondents
Men, 51-79 years: 281 respondents
Women, 51-79 years: 234 respondents

* Excluding pregnant and lactating women and institutionalised people. Participants had not participated in a previous food consumption survey during the last four year, and participation was limited to one person per household. Adequate knowledge of the Dutch language was required.

The source adds the following information about the survey method:
Parents/caretakers of children aged 1 to 8 years, were invited to complete a food diary of their child on two specific days, also covering the consumption at day-care, school or elsewhere. Instructions were given by telephone by the interviewers. The day after the first registration of consumption in the food diary, a face-to-face interview with the parent/caretaker was carried out during a home visit, children aged 4 to 8 years were present during the interview. The second interview for the 24-hour dietary recall was conducted by telephone.
 For children aged 9 to 15 years, the two 24-hour recalls were carried out by means of two face-to-face interviews during home visits. Contact with children aged 9 to 15 years was made initially through a parent or caretaker; the interviews were conducted with the child in presence of the parent or caretaker.
 Participants aged 16 to 69 years were interviewed twice by telephone, unannounced.
 Participants aged 70 to 79 years were asked to fill in a food diary on two specified days, prior to the interview days. Instructions were given by telephone. The day after the first registration of consumption in the food diary a face-to-face interview was carried out during a home visit. The completed diary was used as a memory aid. If possible, the second 24-hour dietary recall interview was conducted by telephone. If a telephone interview appeared to be too difficult, a second home visit was arranged.