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| Barriers to participationa | Respondents | p value |
|---|
| All (N = 51b) | Adolescents aged 14–17 (n = 25) | Young adults aged 18–21 (n = 26) |
|---|
| Commuting time to study site | 24 (47.1) | 14 (56.0) | 10 (38.5) | 0.21c |
| Volume of questionnaires | 18 (35.3) | 10 (40.0) | 8 (30.8) | 0.49c |
| Distress caused by having to talk about painful topics | 18 (35.3) | 8 (32.0) | 10 (38.5) | 0.63c |
| Duration of study appointments | 18 (35.3) | 11 (44.0) | 7 (26.9) | 0.20c |
| Alternating interviewers | 11 (21.6) | 4 (16.0) | 7 (26.9) | 0.34c |
| Distress caused by fears about the results of diagnostics | 9 (17.6) | 2 (8.0) | 7 (26.9) | 0.14d |
| Video recordings | 9 (17.6) | 4 (16.0) | 5 (19.2) | 1.00d |
| Difficulties in scheduling appointmentse | 3 (5.9) | 1 (4.0) | 2 (7.7) | 1.00d |
| Othere | 3 (5.9) | 0 (0) | 3 (11.5) | 0.24d |
| Distress caused by using public transport to the study sitee | 2 (3.9) | 1 (4.0) | 1 (3.8) | 1.00d |
| Reachability of study site | 1 (2.0) | 0 (0) | 1 (3.8) | 1.00d |
| Concerns about confidentiality | 0 (0) | 0 (0) | 0 (0) | Na |
- Na not applicable
- aAssessed with the checklist for barriers to study participation (see Additional file 1). bOverall number of respondents was n = 53, but data from n = 2 respondents had to be excluded because of missing information. cCalculated from 2-sided Pearson χ2 test. dCalculated from 2-sided Fisher’s exact test. eCategory added post hoc according to free responses
