Country of residence and sex of participants, displayed in total and by age groups (n=556)
| Total | 0–14 years | 15–29 years | 30–49 years | 50 years and above | |
| Subjects n | 556 | 172 | 136 | 154 | 94 |
| Country# | |||||
| England | 121 (22) | 34 (20) | 32 (24) | 36 (23) | 19 (20) |
| USA | 101 (18) | 35 (20) | 23 (17) | 26 (17) | 17 (18) |
| Germany | 78 (14) | 34 (20) | 9 (7) | 21 (14) | 14 (15) |
| Switzerland | 42 (8) | 8 (5) | 16 (12) | 5 (3) | 13 (14) |
| Australia | 27 (5) | 11 (6) | 5 (4) | 5 (3) | 6 (6) |
| Italy | 22 (4) | 7 (4) | 6 (4) | 9 (6) | 0 |
| Canada | 20 (4) | 7 (4) | 3 (2) | 6 (4) | 4 (2) |
| The Netherlands | 18 (3) | 2 (1) | 8 (6) | 5 (3) | 3 (3) |
| Scotland | 12 (2) | 4 (2) | 3 (2) | 3 (2) | 2 (2) |
| Denmark | 10 (2) | 1 (1) | 4 (3) | 2 (1) | 3 (3) |
| France | 10 (2) | 3 (2) | 2 (1) | 2 (1) | 3 (3) |
| Norway | 10 (2) | 2 (1) | 0 | 6 (4) | 2 (2) |
| Other European countries | 60 (11) | 14 (8) | 19 (14) | 22 (14) | 5 (5) |
| Other non-European countries | 25 (4) | 10 (6) | 6 (4) | 6 (4) | 3 (3) |
| Sex (n=555) | |||||
| Male | 214 (39) | 92 (53) | 49 (36) | 41 (27) | 32 (34) |
| Female | 340 (61) | 80 (47) | 86 (63) | 113 (73) | 61 (66) |
| Other | 1 (0) | 0 | 1 (1) | 0 | 0 |
Data are presented as n (%). #: countries with n≥10 displayed in table, countries with n<10 were categorised into other European countries and other non-European countries.