Table 1.

Characteristics of studies included in the meta-analysis.

Study	Year	Language	Country	Age range (mean)	Groups	n	Years of onset
Calvis[11]	2006	English	America	53.2 ± 11.8	Male	80	2000–2005
					Female	0
Jiang[12]	2017	English	China	56 ± 7.5	Male	181	2010–2014
					Female	88
Ogata[13]	2006	English	Japan	63.4 ± 7.5	Male	25	2000–2004
					Female	12
Wei[14]	2020	English	China	58 ± 8.5	Male	87	2015–2018
					Female	9
Wei[15]	2017	English	China	47.4 ± 6.5	Male	355	2008–2015
					Female	68
Yang[16]	2020	English	China	52 ± 8.9	Male	56	2014–2017
					Female	6
Zhang[17]	2015	English	China	57 ± 18	Male	174	2008–2014
					Female	80
Zhao[18]	2017	English	China	60.5 ± 7.5	Male	77	2009–2011
					Female	20