Risk of Parkinson’s Disease in the Users of Antihypertensive Agents: An Evidence from the Meta-Analysis of Observational Studies

Table 3

Newcastle-Ottawa Scale to assess the quality of cohort studies.

Study	Selection	Comparability	Outcome	Total score	Quality of the study
Lee et al., 2014 [5]				9	High quality
Pasternak et al., 2012 [6]				9	High quality
Simon et al., 2010 [7]				7	Medium quality
Louis et al., 2009 [8]				8	Medium quality

A study can be awarded a maximum of 4 stars for selection, a maximum of 2 stars for comparability, and a maximum of 3 stars for outcome.