Table 3: Univariate and multivariate analysis of factors contributing to UOS.

Parameter TDC (N=332)UOS (n=106)Univariate AnalysisMultivariate Analysis
OR95% CIP value

Age (>50 years)155 (46.7%)68 (64.1%)0.0012.11.15-3.780.015

Age (>60 years)97 (29.2%)42 (39.6%)0.055

Age (> 70 years)35 (10.5%)18 (17.0%)0.088

Female gender269 (81.0%)78 (73.6%)0.129

BMI ≥ 30 Kg/m2153 (46.1%)52 (49.0%)0.655

BMI ≥ 35 Kg/m270 (21.1%)22 (20.7%)1.000

BMI ≥ 40 Kg/m219 (5.7%)9 (8.5%)0.361

ASA 315 (4.5%)7 (6.6%)0.443

Mean operation time (mins)64.9±21.682.5±35.4<0.0011.01.00-1.040.017

Length of procedure 
(>90 minutes)
43 (12.9%)38 (35.8%)<0.001

OTC performed84 (25.3%)38 (35.8%)0.046

OTCs in those who had 
> 90 minutes procedure
15 (4.5%)16 (15.1%)<0.001

Drain insertion0 (0.0%)26 (24.5%)<0.001

Time leaving recovery 
(after 18:30 hrs)
6 (1.8%)24 (22.6%)<0.00115.15.41-42.34<0.001

Timing of procedure (PM list)165 (49.7%)74 (69.8%)<0.0012.41.30-4.610.005

Intra-operative complications (bowel injury, etc)0 (0.0%)1 (0.9%)0.242

Immediate post-operative complications (urine retention, bleeding)0 (0.0%)7 (6.6%)<0.001

Operations by trainee (Registrar)60 (18.1%)12 (11.3%)0.131