Grouping Category Description (days) 1 Standardized 2 1-3; 4-9; >9 3 1-4; >4 4 1; 2-7; 8-30; >30 5 1-2; 3-7; 8-21; >21 6 1-2; 3-5; 5-14; >14 7 1-3; 4-5; >5 8 1-3; >3

Table 2. Grouping Categories for Length of Stay.