Pre-treatment prognostic nutritional index may serve as a potential biomarker in urinary cancers: a systematic review and meta-analysis

Table 1 Newcastle–Ottawa quality assessments scale

Studies	Year	Quality indicators from Newcastle–Ottawa Scale								Scores
Studies	Year	1	2	3	4	5	6	7	8	Scores
Cai [18]	2017	★	★	–	–	★★	–	★	★	6
Peng [25]	2017	–	★	★	–	★★	★	★	★	7
Miyake [24]	2017	★	★	–	★	★★	–	★	–	6
Cui [23]	2017	–	★	–	★	★★	★	–	★	6
Huang [26]	2017	★	–	★	★	★★	–	★	★	7
Fan [28]	2017	★	★	–	★	★★	–	★	★	7
Broggi [17]	2016	★	–	★	★	★★	–	★	–	6
Kwon [21]	2017	★	★	–	★	★★	★	★	–	7
Peng [22]	2017	★	–	–	★	★★	–	★	★	6
Jeon [20]	2016	★	★	–	★	★★	★	–	★	7
Kim [27]	2015	–	★	★	–	★★	★	★	★	7
Hofbauer [19]	2015	★	–	★	★	★★	–	★	★	7

1. Representativeness of the exposed cohort; 2. Selection of the non-exposed cohort; 3. Ascertainment of exposure; 4. Outcome of interest not present at start of study; 5. Control for important factor or additional factor; 6. Assessment of outcome; 7. Follow-up long enough for outcomes to occur; 8. Adequacy of follow up of cohorts

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