| Study | Eligible for discussion with parents (N) | Approached (N) | Consented (N) | Consent rate (%) | Time for screening (min) | Time for discussion (min) | Mean time spent on screening and discussions for each consent participant (min) |
| A | 97 | 75 | 72 | 95 | 20 | 30 | 58 |
| B | 250 | 183 | 134 | 73 | 20 | 30 | 78 |
| C | 261 | 99 | 10 | 10 | 30 | 45 | 1228 |