Table 18. Number of studies that use an appropriate statistical method.

Species	Unclear	No	Yes	Yes (%)
Mouse (n = 10) †	4	0	16	80
Primate (n = 13) †	4	0	22	85
Rat (n = 16) †	1	1	30	94
All (n = 39) †	9	1	68	87*

^†Numbers of studies in phase 2 that were assessed independently by two assessors and used a statistical method; numbers in each row sum to twice the number of studies.

^*Of the 48 studies assessed in more detail, and that used and described a statistical method, 87% (34/39) were judged to have used a correct statistical method, and in 12% (5/39) of the papers assessed there was insufficient information reported in the publication to be able to make this judgement.