In 2012-2013, all still eligible 29,532 DIS-I participants were invited for DIS-II, of whom 22,132 (75%) agreed to participate. In addition, 12,694 (62%) of 20,468 new randomly selected donors participated. Altogether 34,826 donors completed the written DIS-II questionnaire.
The DIS-II questionnaire (pdf) was similar to the DIS-I questionnaire, but slightly updated. The questionnaires consisted of questions regarding demographic characteristics, donation, lifestyle, health and disease, family composition and medical history as well as menstruation, menopause and pregnancy.
For more information check the flowchart of the Donor InSight population.