Secondary outcomes
| Short message and protocol (n=36) | Long message (n=40) | |
| Number of emails before response received | ||
| 1 | 16 (44%) | 15 (38%) |
| 2 | 6 (17%) | 10 (25%) |
| 3 | 3 (8%) | 3 (8%) |
| 4 | 2 (6%) | 2 (5%) |
| No response | 9 (25%) | 10 (25%) |
| Mean [SD] | 1.7 [1.0] | 1.7 [0.9] |
| Median [25th, 75th centile] | 1 [1, 2] | 1.5 [1, 2] |
| Min, max | 1, 4 | 1, 4 |
| First response outcome | ||
| Negative | 2 (6%) | 8 (20%) |
| Neutral | 9 (25%) | 14 (35%) |
| Positive | 16 (44%) | 8 (20%) |
| Eventual outcome | ||
| Agree to collaborate | 11 (31%) | 10 (25%) |
| Do not agree to collaborate | 3 (8%) | 11 (28%) |
| No decision reached | 13 (36%) | 9 (23%) |
| No response | 9 (25%) | 10 (25%) |
Data are n (%) unless otherwise specified. Data are presented on author level, rather than trial level.