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| Species | No | Yes | Yes (%) |
| Mouse (n = 72) | 67 | 5 | 7 |
| Primate (n = 86) | 83 | 3 | 7 |
| Rat (n = 113) | 89 | 24 | 20 |
| All (n = 271) | 239 | 32 | 12† |
Random allocation of animals to experimental groups was reported in only 12% (32/271) of all the studies in the survey.
