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Recruitment by trial arm.
| Recruitment by servicea | Morphine n (%) | Ketamine n (%) | Total n (%) |
| YAS | 113 (48%) | 112 (50%) | 225 |
| WMAS | 121 (52%) | 112 (50%) | 233 |
| Recruitment by experience b | |||
| NQP | 106 (45.3%) | 93 (41.5%) | 199 (43.4%) |
| Experienced paramedic | 128 (54.7%) | 131 (58.5%) | 259 (56.6%) |
a Chi square (1, N = 458) = 0.1338, p = 0.715
b Chi square (1, N = 458) = 0.666, p = 0.414
