Skip to main content
. 2021 Mar 5;28(16):19629–19642. doi: 10.1007/s11356-021-13211-2

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