Mooney 2013.

Methods	Retrospective review
Participants	1518 1C‐IV ovarian carcinoma with bowel obstruction
Interventions	Surgical management 373, non‐surgical management 1145
Outcomes	Median survival after first post‐diagnosis obstruction: surgical 162 days; non‐surgical 98 days, P value < 0.001 30‐day mortality; surgical 13.1%; non‐surgical 24.2%, P value < 0.001 Days in hospital, median (IQR): surgical 24 (16, 42), non‐surgical 17 (8, 32), P value < 0.001 Days out of hospital, median (IQR): surgical 137 (29, 536); non‐surgical 80 (17, 412), P value < 0.002 Ratio of days out to days in hospital: surgical 6.2:1; non‐surgical 5.3:1, P value = 0.28 Re‐admission for obstruction: surgical 33.5%; non‐surgical 35.9%, P value = 0.403
Notes	Uses Surveillance, Epidemiology, and End Results ‐ Medicare database that tracks 26% of patients with cancer in the US population by searching for coded information on billing for procedures and services rendered Hospitalisation and re‐admission rates used as a proxy for quality of life markers
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	Coding/billing information reflected that patients were allocated to surgery by clinician/patient choice and retrospectively reviewed
Allocation concealment (selection bias)	High risk	Coding/billing information reflected that patients were allocated to surgery by clinician/patient choice and retrospectively reviewed
Blinding (performance bias and detection bias) All outcomes	High risk	Coding/billing information reflected that patients were allocated to surgery by clinician/patient choice and retrospectively reviewed
Blinding of participants and personnel (performance bias) All outcomes	High risk	Coding/billing information reflected that patients were allocated to surgery by clinician/patient choice and retrospectively reviewed
Blinding of outcome assessment (detection bias) All outcomes	High risk	Coding/billing information reflected that patients were allocated to surgery by clinician/patient choice and retrospectively reviewed
Selective reporting (reporting bias)	Unclear risk	Not reported by surgical procedure ‐ unclear it this information was available via coding or not