Table 4.

Focus of studies and number of studies conducted outdoors and indoors

Focus of study			Hospitals studied indoors				Hospitals studied outdoors				Hospitals studied outdoors and indoors
Out. and In.	Out.	In.	One	Two	≥ Three	N.c.	One	Two	≥ Three	N.c.	One	Two	≥ Three
1	5	27	21	2	3	1	-	2	3	-	1	-	-

Out. outdoors, In. indoors, N.c. not cited