Table 2.

Proportional odds model with time SAP < 80% pre-induction baseline as a hypothesised predictor

Model
Time SAP < 80% pre-ind + age at surgery + gender + pre-op Charlson Comorbidity Index
Coefficient	β	SE	Odds ratio	95% CI	P value*
Intercept 0|1	3.314	2.078
Intercept 1|2	4.562	2.099
Intercept 2| ≥ 3	6.939	2.225
Time SAP < 80% pre-ind	0.02017	0.00681	1.020	1.008–1.035	0.003
Age at surgery	0.06990	0.02591	1.072	1.023–1.134	0.007
Pre-op Charlson CI	− 0.17153	0.10938	0.842	0.676–1.042	0.117
Gender (Female)	− 0.93429	0.74854	0.393	0.085–1.661	0.212

*P value obtained from Wald’s test statistic