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Conversion rates to full-time hospitalization between groups and according to the cause of hospitalization (n=4388).
| Cause | Telephone group (n=2160) | SMSa group (n=2228) | P value |
| Total | 26 (1.20) | 8 (0.36) | .001 |
| Anesthetic | 15 (0.69) | 4 (0.18) | .01 |
| Surgical | 7 (0.32) | 3 (0.13) | .22 |
| Organizational | 4 (0.19) | 1 (0.04) | .12 |
aSMS: short message service.
