表 3. Multiple collinearity test.

多重共线性检验

Index	Tolerance	VIF
VIF: variance inflation factor. All other abbreviations in the table are the same as those in Table 1.
Age	0.799	1.252
Operation time	0.645	1.543
Depth of anesthesia	0.565	1.770
Intraoperative bleeding	0.953	1.049
Postoperative analgesic protocol	0.647	1.546
MPV	0.782	1.278
PDW	0.486	2.058
VAS	0.811	1.234
Mean intraoperative rSO2	0.788	1.269
PSQI	0.749	1.335