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| Species | No | Yes | Unclear | Yes (%) |
| Mouse (n = 72) | 24 | 47 | 1 | 65 |
| Primate (n = 86) | 30 | 55 | 1 | 64 |
| Rat (n = 113) | 15 | 98 | 0 | 87 |
| All (n = 271) | 69 | 200 | 2 | 74† |
74% (200/271) of all studies reported the sex of the animals used in the main experiment.
