Effects of bupivacaine or levobupivacaine on cerebral oxygenation during spinal anesthesia in elderly patients undergoing orthopedic surgery for hip fracture: a randomized controlled trial

Table 5 Multivariate model for intraoperative desaturation risk

	N	Mean	SD	OR (CI 95%)	p value
rCSO2 –Right ^a (overall)	56	59.41	10.128		0.020
1st quartile	15	47.53	7.954	61.1 (3.3 to 1127.9)	0.006
2nd quartile	14	55.79	1.626	37.6 (2.2 to 635.2)	0.012
3rd quartile	12	64.00	2.000	2.1 (0.4 to 12.1)	0.429
4th quartile	15	71.00	2.803	(Ref)
MAPmin ^b (overall)	54	55.00	14.17		0.145
1st quartile	13	36.23	7.33	28.7 (1.4 to 604.8)	0.031
2nd quartile	15	51.80	2.98	9.9 (0.8 to 122.3)	0.074
3rd quartile	13	59.92	1.89	4.3(0.4 to 51.3)	0.244
4th quartile	13	72.54	8.07	(Ref)
Exp				0.085	0.045

OR Odds Ratio, CI Confidence interval, MAP Mean Arterial Pressure, SD Standard Deviation
^aBaseline regional Cerebral Saturation of Oxygen in Right Hemisphere; ^bMinimum value for Mean Arterial Blood pressure, intraoperative

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