Thong 2010.

Methods	Cohort Retrospective Cross‐sectional
Participants	340 patients APE 79, AR 149 Patients selected through a weighted random selection among survivors. Weights derived from distribution of rectal cancer survivors in the general population. Netherlands
Interventions	Quality of life assessment with SF‐36 and QLQ‐CR38
Outcomes	Quality of life
Notes	Evidence level: 2B. Not stated: Age, gender, tumour stage, tumour and anastomotic distance from anal verge; pouch
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	High risk	Retrospective, cross‐sectional cohort study. Patients selected through a weighted random selection among survivors. Weights derived from distribution of rectal cancer survivors in the general population.
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	Low risk	All included patients completed the study.
Selective reporting (reporting bias)	Low risk	All QoL data reported.