Table 5.

Odds ratios of intraoperative reduction of rSO₂ of each cut-offs for postoperative delirium in patients under age 68

Intraoperative rSO2	Unadjusted OR (95% CI)	P-values	Adjusted OR (95% CI)	P-values
Mean	0.920 (0.869 to 0.975)	0.004	0.927 (0.874 to 0.984)	0.01
Minimum	0.934 (0.886 to 0.984)	0.01	0.940 (0.891 to 0.992)	0.03
Duration of rSO2 reduction (for every 5 min)
< 75%	0.999 (0.982 to 1.016)	0.87	0.997 (0.979 to 1.016)	0.78
< 70%	1.001 (0.985 to 1.016)	0.95	0.999 (0.982 to 1.016)	0.89
< 65%	1.005 (0.992 to 1.018)	0.48	1.003 (0.988 to 1.017)	0.73
< 60%	1.008 (0.997 to 1.019)	0.16	1.005 (0.993 to 1.018)	0.36
< 55%	1.011 (1.001 to 1.022)	0.03	1.012 (1.001 to 1.022)	0.04
< 50%	1.015 (1.005 to 1.025)	0.004	1.015 (1.004 to 1.025)	0.006
< 45%	1.016 (1.003 to 1.029)	0.02	1.015 (1.002 to 1.029)	0.02
< 40%	1.014 (0.987 to 1.042)	0.3	1.010 (0.982 to 1.039)	0.49
< 35%	1.017 (0.980 to 1.057)	0.37	1.011 (0.972 to 1.052)	0.59
Occurrence of rSO2 reduction
< 75%	.	1	.	1
< 70%	.	1	.	1
< 65%	.	1	.	1
< 60%	.	1	.	1
< 55%	4.970 (0.654 to 37.782)	0.12	4.231 (0.551 to 32.480)	0.17
< 50%	4.156 (1.191 to 14.503)	0.03	4.013 (1.112 to 14.482)	0.03
< 45%	2.634 (1.034 to 6.709)	0.04	2.283 (0.906 to 6.266)	0.08
< 40%	2.662(0.971 to 7.295)	0.06	2.757(0.980 to 7.757)	0.06
< 35%	1.114(0.141 to 8.817)	0.92	0.989(0.118 to 8.300)	0.99

OR Odds ratio, CI Confidence interval, rSO₂ Regional cerebral oxygen saturation