Table 17. Number of papers which used statistical methods reported the method used and also used an error measure.

Species	Statistical methods described†	Statistical method(s) used	Error measures‡
			Not used	Used
Mouse	No	No	4	7
		Yes	3	10
	Yes	No	1	0
		Yes	6	41
Primate	No	No	8	1
		Yes	8	15
	Yes	No	1	0
		Yes	9	44
Rat	No	No	0	2
		Yes	7	12
	Yes	No	0	0
		Yes	3	89
All	No	No	12	10
		Yes	18	37
	Yes	No	2	0
		Yes	18	174*

^†Statistical methods described in materials and methods section of paper.

^‡Standard error of the mean, confidence interval, standard deviation or other error measurement.

^*70% (174/247); 91% (247/271) of all included studies used statistical methods to analyse the data; 17% (46/267) of the studies, that presented numerical data, did not present a measure of variation (e.g. standard deviation) or uncertainty (e.g. standard error of the mean [SEM] or confidence interval [CI]).