Table 5.

Results of logistic regression analysis of factors associated with severity of post-operative complications

Variable	Estimate	Standard error	Wald test	Odds ratio	P-value
Time from onset of symptom to hospital admission (hours)	−0.705	0.08	38.4	0.35	0.0001
Time from hospital admission	−0.701	0.11	59.3	0.47	0.0001
to surgery (hours) ASA grade	−0.628	0.13	20.2	0.55	0.003
Duration of operation (hours)	−0.517	0.12	18.5	0.49	0.001
Age (years)	−0.245	0.27	2.6	1.35	0.085
Sex	−0.221	0.25	1.7	1.06	0.271

ASA= American Society of Anaesthesiologists