Prognostic roles nutritional index in patients with resectable and advanced biliary tract cancers

Table 2 Results of quality assessment using the Newcastle-Ottawa Scale for cohort studies

Ref.	Selection				Comparability	Outcome			NOS score
	Representativeness of the exposed cohort	Selection of the non-exposed cohort	Ascertainment of exposure	Demonstration that outcome of interest was not present at start of study	Comparability of cohorts based on the design or analysis	Assessment of outcome	Was follow-up long enough for outcomes to occur	Adequacy of follow up of cohorts
Huang et al[32], 2024	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8
Utsumi et al[33], 2024	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8
Utsumi et al[34], 2024	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	7
Zhu et al[35], 2023	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8
Matsumoto et al[36], 2024	Yes	Yes	Yes	Yes	Yes (very well)	Yes	Yes	Yes	9
Yang et al[37], 2023	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8
Li et al[38], 2023	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8
Hayashi et al[39], 2023	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	7
Cao et al[40], 2022	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8
Wang et al[41], 2021	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8
Jin et al[42], 2021	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8
Utsumi et al[43], 2021	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	7
Salati et al[44], 2020	Yes	Yes	Yes	Yes	Yes (very well)	Yes	Yes	Yes	9
Akgül et al[45], 2018	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8
Zhang et al[46], 2016	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8
Deng et al[47], 2016	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8
Wang et al[41], 2021	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	8

Risk of bias summary and graph showing authors’ judgments about each risk of bias domain for observational studies using the Newcastle-Ottawa Scale tool. NOS: Newcastle-Ottawa Scale.