Figure 17 depicts a bar chart, with bars going left to right, titled, risk of bias of the single retrospective cohort study answering KQ3b. The percentages range from 0 percent to 100 percent. They are colored to depict one of three different answers to each question. The answers could either be yes, no, or unclear. For the question, "Investigators and particpats blinded to testing" the answer is unclear 100 percent; "Blinded assessment of outcomes?", unclear 100 percent; "Groups comparable at baseline?, yes 100 percent; outcomes adequately described?", yes 100 percent; "Intention to treat anaylsis?", yes 100 percent; "potential for conflict of interest?", no 100 percent; "High loss to follow-up or differential loss to follow-up between groups?", no 100 percent; "Adequate sample size?", yes 100 percent; "Selection bias minimized?", unclear 100 percent; "Methods to control for concounding?", unclear 100 percent; "Appropriateness of the TPMT test?", yes 100 percent.

Figure 17Risk of bias of the single retrospective cohort study answering KQ 3b

From: 3, Results

Cover of Assessment of Thiopurine Methyltransferase Activity in Patients Prescribed Azathioprine or Other Thiopurine-Based Drugs
Assessment of Thiopurine Methyltransferase Activity in Patients Prescribed Azathioprine or Other Thiopurine-Based Drugs.
Evidence Reports/Technology Assessments, No. 196.
Booth RA, Ansari MT, Tricco AC, et al.

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