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Questionnaires

The questionnaire for DIS-I (pdf) was self-administered, mainly multiple choice and comprised 102 items in Dutch. During DIS-II, the same, slightly updated questionnaire was used. Six topics were covered in the questionnaire. For DIS-III, the questionnaires will be uploaded once the data collection has been completed.

DIS-I & DIS-II

Topic Subjects
Demographic characteristics Household, ethnicity, education and employment.
Donation Experiences with the blood bank and blood donation, including short-term effects and a very broad assessment of potential motivators for and barriers to blood donation.
Lifestyle Diet, smoking, alcohol use, physical activity and travel behaviour.
Health and disease Health status, medication use and medical history.
Family composition Information on family composition and family members giving or receiving blood was collected in detail. Data on cancer, myocardial infarction and stroke events in the family were also collected.
Psychological constructs Such as the Theory of Planned Behaviour (TPB), based on previously published measures and concepts such as trust and altruism.
Females Information concerning menstruation pattern, contraceptive use, menopause, reproductive organ surgery and pregnancies.

DIS-III

Topic Subjects
Lifestyle International physical activity questionnaire (IPAQ), short version of Food Frequency Questionnaire (FFQ), smoking, alcohol use and medication use.
Symptoms associated with iron deficiency SF-12 (general health), restless legs syndrome, cognitive functioning, pica, fatigue
Females nformation concerning menstruation pattern, contraceptive use, menopause, reproductive organ surgery and pregnancies.

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