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Table 2 Regression analyses of risk factors for conversion

From: Lower conversion rate with robotic assisted rectal resections compared with conventional laparoscopy; a national cohort study

  Conversion rate (per cent) Univariable
OR (95% CI)
p value Multivariable
aOR (95% CI)
p value
All patients 95/1284 (7.4)     
Age group      
  < 65 37/503 (7.4) Ref 0.411   
 65–80 43/631 (6.8) 0.91 (0.58–4.45)    
  > 80 15/150 (10.0) 1.40 (0.75–2.63)    
Sex      
 Female 24/502 (4.8) Ref 0.014 Ref 0.014
 Male 71/782 (9.1) 1.98 (1.23–3.21)   1.86 (1.14–3.06)  
WHO ECOG-score      
 0, 1 89/1210 (7.4) Ref 0.974   
 2, 3, 4 5/67 (7.5) 1.02 (0.39–2.59)    
ASA classification      
 1–2 63/871 (7.2) Ref 0.742   
 3–4 32/413 (7.7) 1.08 (0.69–1.68)    
Severe pulmonary disease      
 No 93/1236 (7.5) Ref 0.391   
 Yes 2/48 (4.2) 0.53 (0.29–2.34)    
Severe cardiac disease      
 No 83/1211 (6.9) Ref 0.003 Ref 0.029
 Yes 12/73 (16.4) 2.67 (1.39–5.16)   2.16 (1.08–4.31)  
Med. Diabetes      
 No 79/1150 (6.9) Ref 0.036   
 Yes 16/134 (11.9) 1.84 (1.04–3.25)    
Weight class (BMI)      
  < 18.5 1/24 (4.2) 0.72 (0.09–5.54) 0.007 0.87 (0.12–6.89) 0.002
 18.5–25 29/511 (5.7) Ref   Ref  
 25–30 32/496 (6.5) 1.15 (0.68–1.93)   1.08 (0.63–1.83)  
  > 30 29/228 (12.7) 2.42 (1.41–4.16)   2.64 (1.51–4.61)  
Radio(chemo)therapy      
 No 71/909 (7.8) Ref 0.381   
 Yes 24/375 (6.4) 0.81 (0.50–1.30)    
Operative technique      
 LAR 60/743 (8.0) 1.72 (1.03–2.87) 0.012 1.66 (0.97–2.84) 0.021
 Hartmann 14/109 (14.3) 2.88 (1.42–5.88)   2.88 (1.35–6.13)  
 APR 21/432 (4.8) Ref   Ref  
Robotic assistance      
 No 87/909 (9.6) Ref  < 0.001 Ref  < 0.001
 Yes 8/375 (2.1) 0.21 (0.09–0.43)   0.22 (0.10–0.46)