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Table 3 Number of Participants according to group size who signed the informed consent, are online or completed the first online-survey of the NutriAct Family Study on Determinants of Food Choice (NFS) until August 4, 2017; Potsdam, Germany

From: The NutriAct Family Study: a web-based prospective study on the epidemiological, psychological and sociological basis of food choice

Group size Total N Families Total N Persons Not yet online N Persons Started online surveya N Persons Completed all 4 questionnaires N Persons
Two siblings (no spouse) 10 20 6 10 4
Two spouses (no sibling) 311 622 144 250 228
 and 1 sibling 112 336 30 138 168
 and 2 siblings 11 44 4 12 28
 and 3 siblings 2 10 5 5 0
Total 446 1032 189 415 428
  1. a Access to the online-questionnaires is mailed when 2 persons in a group have returned the signed informed consent by mail. The completion of the group is then subject to reminding activities by phone and e-mail. If finally the third person fails to join, the group will nevertheless be accepted