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Patients interested in using the SMS text message system after n minutes.
| Number of minutes | Patients, n (%) |
| 0 | 45 (45) |
| 10 | 51 (51) |
| 20 | 63 (63) |
| 30 | 75 (75) |
| 40 | 75 (75) |
| 50 | 75 (75) |
| 60 | 87 (87) |
| 70 | 87 (87) |
| 80 | 88 (88) |
| 90 | 93 (93) |
| 100 | 93 (93) |
| 110 | 93 (93) |
| 120 | 100 (100) |
