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| Species | No | Yes | Unclear | Yes (%) |
| Mouse (n = 72) | 3 | 66 | 3 | 92 |
| Primate (n = 86) | 3 | 80 | 3 | 93 |
| Rat (n = 113) | 1 | 112 | 0 | 99 |
| All (n = 271) | 7 | 258 | 6 | 95† |
95% (258/271) of all studies stated the purpose of the study in the introduction; 3% (7/271) did not and in 2% (6/271) the purpose of the study was unclear to the assessors.
