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| Species | No | Yes | Unclear | Yes (%) |
| Mouse (n = 72) | 1 | 71 | 0 | 99 |
| Primate (n = 86) | 1 | 84 | 1 | 98 |
| Rat (n = 113) | 0 | 112 | 1 | 99 |
| All (n = 271) | 2 | 267 | 2 | 99† |
99% (267/271) of the included studies presented numerical data. The study was scored “Yes” if numerical data were presented graphically, in tabular form or in the text, either for each animal or by treatment group.
