Regression analyses of ITS on the changes in duration of hospital stay and peri-operative antibiotic treatment in the 4 types of clean surgeries.

Changes in level and slope in the days of hospital stay (dHS), as well as the duration of peri-operative antibiotic treatment (dAT) received by patients undergoing 4 clean surgeries of thyroidectomy, breast surgery, hernia, or orthopedic procedures in the 65 hospitals were analyzed. The parameters of β1 to β5, expressed as Mean (SE), were described in the Methods.*p **p ***p Regression analyses of ITS on the changes in duration of hospital stay and peri-operative antibiotic treatment in the 4 types of clean surgeries.