Cognitive Changes following Bilateral Deep Brain Stimulation of Subthalamic Nucleus in Parkinson’s Disease: A Meta-Analysis

Table 2

Risk of bias results assessed with methodological index for nonrandomized studies (MINORS).

Study	A stated aim of the study	Inclusion of consecutive patients	Prospective collection of data	Endpoint appropriate to the study aim	Unbiased evaluation of endpoints	Follow-up period appropriate to the major endpoint	Loss to follow-up not exceeding 5%	Prospective calculation of the study size	Total score
Cilia et al., 2007 [15]	2	0	2	2	0	2	2	0	10
Zangaglia et al., 2009 [16]	2	2	2	2	0	2	2	0	12
York et al., 2008 [17]	2	0	2	2	0	2	2	0	10
Williams et al., 2011 [18]	2	2	2	2	0	2	2	0	12
Merola et al., 2014 [19]	2	2	2	2	0	2	2	0	12
Castelli et al., 2010 [20]	2	2	2	2	0	2	2	0	12
Smeding et al., 2006 [21]	2	0	2	2	0	2	2	0	10