Pecorelli 1994.

Methods	Retrospective review
Participants	147 patients from 1973 to 1983; all patients had recurrent ovarian carcinoma
Interventions	117 patients had a definite procedure; 30 patients no surgical correction
Outcomes	"Benefit of surgery" defined as able to leave hospital on a regular/low residue diet: 83/117 (71%) Perioperative mortality: 15/117 (13%) for corrective surgery; 23/147 (16%) for total Median survival: 3.5 months, mean 7.2 (? group)
Notes	Intestinal resections in 13%, bypass in 17% and neostomy in 50% Benefit of surgery not synonymous with relief of symptoms as suggested
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	Patients allocated to surgery by clinician/patient choice and retrospectively reviewed
Allocation concealment (selection bias)	High risk	Patients allocated to surgery by clinician/patient choice and retrospectively reviewed
Blinding (performance bias and detection bias) All outcomes	High risk	Patients allocated to surgery by clinician/patient choice and retrospectively reviewed
Blinding of participants and personnel (performance bias) All outcomes	High risk	Patients allocated to surgery by clinician/patient choice and retrospectively reviewed
Blinding of outcome assessment (detection bias) All outcomes	High risk	Patients allocated to surgery by clinician/patient choice and retrospectively reviewed
Selective reporting (reporting bias)	Unclear risk	Median survival reported as 3.5 months but the group this is based on is not stated