I would like to look into the difference of CRC patients in selection for MIS or open surgery by comparing the odd ratio. In analyzing the MIS (minimally invasive surgery) data, I am wondering whether I should add converted cases to open surgery or to the MIS. As the intention to treatment for these cases was MIS initially but they converted intra-operatively to conventional open surgery.
Lap assisted colorectal surgery is most often performed,Ex-For R hemicolcectomy I often do extra corporial anastamosis,similarly for ultra low or coloanal ,I devide the the rectum by open method and to insert the anvil.So it is difficult to answer your question.
Look at the large trials to date - COLOR, CLASIC etc. They provide good definitions for this subset, which will make your decision easier.
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