Outcomes of Drug-Eluting Stents in comparison to Bare Metal Stents in Cancer Patients with Percutaneous Coronary Intervention: A Systematic Review and Meta-Analysis

Table 3

Risk of bias assessment of the included observational studies.

Modified Newcastle-Ottawa scale	Studies
	Ahmed et al. [24]	Munawar et al. [23]	Guo et al. [7]	Potts et al. [25]
Selection	4	4	4	4
Comparability	1	2	1	2
Adjustment	Unadjusted	Adjusted	Unadjusted	Adjusted
Outcome	3	2	3	3
Total (maximum score = 9)	8	8	8	9

For selection, the highest score was 4 based on the representativeness of the exposed cohort, selection of the nonexposed cohort, ascertainment of the exposure, and outcome of interest at the start of the study; for comparability, the highest score was 2 based on comparability of the cohort; and for outcome, the highest score was 3 based on assessment of the outcome, follow-up period, and adequacy of the follow-up.