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. 2012 Dec 12;2012(12):CD004323. doi: 10.1002/14651858.CD004323.pub4

Krouse 2009.

Methods Case‐control 
 Retrospective 
 Cross‐sectional.
Participants 491 patients (304 men, 187 women). Patients included rectal cancer survivors 
 with permanent ostomies (termed "cases", 246 patients) and those who had similar rectal cancer 
 treatment‐related procedures but who had an anastomosis (termed "controls", 245 patients). 
 Presurvey matching was conducted by age (within 5 years), sex, and time interval since diagnosis (5‐year intervals). Patients who had their ostomy reversed were excluded from this study. 
 USA.
Interventions Quality of life assessment with SF‐36v2 and mCOH‐QoL‐ 
 Ostomy
Outcomes Quality of life
Notes Evidence level: 3B. 
 Not stated: Tumour grade; 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 case‐control study. APE patients surviving five years after their diagnosis and meeting inclusion criteria, were matched with patients, who had similar rectal cancer related treatment but with anastomosis.
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.