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

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

Group size	Total N Families	Total N Persons	Not yet online N Persons	Started online survey^a 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

^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

ISSN: 1471-2458