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. 2005 Apr 20;2005(2):CD003145. doi: 10.1002/14651858.CD003145.pub2

Hewitt 1998.

Methods RCT, 
 sample size calculation; 
 time of randomisation not stated; 
 conversions excluded from analysis.
Participants n = 15 
 Inclusion: Carcinoma. 
 Exclusion: >80 yrs., previous abdominal surgery, rectal tumor < 10cm from anal verge, 
 advanced local disease, metastatic disease, debilitating concurrent disease, immunomodulatory drugs, blood products within 6 months preoperative. 
 Approximately 250 pts. excluded because of immunomodulatory drugs.
Interventions laparoscopic vs. conventional 
 Conversions: wrong tumor location 1. 
 Type of resection: left colon 4 vs. 5, rectal 3 vs. 3, segmental 1 vs. 0. 
 Tumor stage: Dukes A 1 vs. 1 
 Dukes B 3 vs. 3 Dukes C 4 vs. 4
Outcomes Main study criterium: "immunology". Data given for: operative time, analgetics, morbidity, hospital stay
Notes Operative technique: gas insufflation. 
 conventional incision: not stated. 
 Anesthesia/Analgesia: standardized, systemic on demand or pca. drugs: pethidin or morphine. 
 Evans & Pollock: Design 12, Analysis 13, 
 Presentation 10, Total 35.
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment? Unclear risk B ‐ Unclear