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 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 |
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