Table 14. Number of studies that used qualitative scores reporting blinding.

Species	Blinding	No. of qualitative scores
		0	1	≥2
Mouse (n = 72)	No	60	5	4
	Yes	3	0	0
Primate (n = 86)	No	74	1	6
	Yes	1	1	3
Rat (n = 113)	No	91	4	10
	Yes	7	1	0
All (n = 271)	No	225	10	20
	Yes	11	2	3

Blinding would usually be expected to be used, and reported, in those studies where qualitative scores were used. The percentage of papers which reported using blinding where one or more qualitative variables were used; All = 14% (5/35); Mouse = 0% (0/9); Primate = 36% (4/11) and Rat = 7% (1/15).