The value of miR-155 as a biomarker for the diagnosis and prognosis of lung cancer: a systematic review with meta-analysis

Table 3 Newcastle–Ottawa quality assessments scale

First author	Year	Quality indicators from Newcastle–Ottawa Scale								Scores
First author	Year	1	2	3	4	5	6	7	8	Scores
Raponi [28]	2009	★	★	–	–	★★	★	★	★	7
Saito [29]	2011	★	★	–	★	★★	★	★	★	8
Yi G [30]	2014	★	★	–	–	★★	★	★	★	7
Voortman [31]	2010	–	–	–	★	★★	★	★	★	6
Donnem [32]	2011	★	–	–	–	★★	★	★	★	6
Sanfiorenzo [33]	2013	★	★	–	★	★★	★	★	★	8
Xue [34]	2016	★	★	–	★	★★	★	★	–	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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