Table 4.

Risk factors for MSI

BMI	N	Mean BMI	SD	p value
Under 20 kg/m2	18	16.23	± 2.579	0.228
20.1–27 kg/m2	58	23.82	± 1.577	0.128
27.1–35 kg/m2	57	27.09	± 2.253	0.288
Above 35 kg/m2	12	40.09	± 3.600	0.005

Operative time	N	Mean op.time	SD	p value
60 min. or less	41	34.83	± 15.26	< 0.001
61 to 120 min	52	90.12	± 18.26	< 0.001
121–180 min	25	143.97	± 16.72	0.012
181 min. or more	27	254.67	± 94.29	< 0.001

The variables that increase de risk of MSIs are presented in the table, others variables as team changes, blood loss, sudden complications, were analyzed and did not show differences in the results

N Number of cases, BMI Body mass index, SD standard deviation, Op. operative