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Fig S1: Schoenfield residual plots for Model 2: a) heart rate at 48 h post operatively; b) serosal colour; and c) colic during post operative hospitalisation. These graphs demonstrate proportionality throughout survival time, with all plots having no significant pattern over time.

Fig S2: (a,b) Log minus log cumulative hazard plots for categorical variables in the final Cox proportional hazards regression model (Model 2) for survival in 89 horses surviving anaesthesia following surgery with large colon volvulus. These graphs demonstrate proportionality throughout survival time.

Table S1: Univariable associations of preoperative categorical variables (Cox proportional hazards model) with post operative death in 116 horses with a large colon volvulus ≥360° undergoing exploratory laparotomy.

Table S2: Univariable associations of preoperative continuous variables (Cox proportional hazards model) with post operative death in 116 horses with a large colon volvulus ≥360° undergoing exploratory laparotomy.

Table S3: Univariable associations of pre-, intra- and post operative categorical variables (Cox proportional hazards model) with post operative death in 89 horses surviving anaesthesia following surgery for large colon volvulus ≥360°.

Table S4: Univariable associations of pre-, intra- and post operative continuous variables (Cox proportional hazards model) with post operative death in 89 horses surviving anaesthesia following surgery for large colon volvulus ≥360°.

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