Table 1.

The numbers of mouse cages and rats at the institutions participating in the survey

		% of participating institutions
No. of mouse cages
	<5000	17
	5000–15,000	32
	15,000–30,000	29
	30,000–60,000	17
	>60,000	5
No. of rats
	<1000	61
	1000–3000	29
	3000–5000	5
	>5000	5