Yoo 2005.

Methods	Cohort Prospective Longidudinal.
Participants	98 rectal cancer patients. Follow‐up 6 month. USA
Interventions	FACT‐C
Outcomes	Quality of life.
Notes	Evidence level: 2B. Not stated: Age, men/ women ratio; Tumour and anastomotic distance fro anal verge; pouch.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	High risk	Longitudinal, prospective cohort study. Patients having surgery for rectal cancer were enrolled by random sampling.
Blinding (performance bias and detection bias) Anterior resection or abdominoperineal resection	High risk	Blinding not possible due to surgical therapy.
Incomplete outcome data (attrition bias) Quality of life	Unclear risk	Paper does not yield sufficient data, whether all included patients supplied data.
Selective reporting (reporting bias)	High risk	Data not presented. Data commented in paper.

Evidence level according to Oxford‐Centre of Evidence‐based Medicine.