Table 1. Number of papers classified into general type of treatment procedure described in the study.

Species	Behaviour-Diet	Drug-Chemical	Immunization-Infection	Surgical	Other	Total
Mouse (n = 72)	6	14	29	2	21	72
Primate (n = 86)	30	14	13	15	14	86
Rat (n = 113)	17	46	6	25	19	113
All (n = 271)	53	74	48	42	54	271