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Table 1: Characteristics of the included studies
Author Year Centers Design Device Used Size (Patients) Mean Age (yr) Median NIHSS Score
Aleu et al²¹ 2011 Single Retrospective Ret stent 54 68 19
Castaño et al²⁴ 2010 Single Retrospective Ret stent 20 65.6 19
Devlin et al³⁷ 2007 Single Retrospective Merci 25 63 18
Frei et al¹⁸ 2011 Multi Prospective Penumbra 53 63 18
Grunwald et al³⁸ 2009 Single Retrospective Penumbra 29 58.4 20
Kang et al²⁵ 2011 Multi Retrospective Penumbra 22 59 18.1
Kulcsár et al²⁶ 2010 Single Prospective Penumbra 27 66 14
Lee et al³⁹ 2009 Single Retrospective Merci 17 67 18
Menon et al²³ 2011 Single Prospective Penumbra 27 61.5 18
Menon et al⁴⁰ 2012 Single Prospective Ret stent 14 62.1 14
Pereira et al²² 2011 Single Prospective Ret stent 25 66.3 18.7
Penumbra Pivotal Stroke Trial Investigators¹³ 2009 Multi Retrospective Penumbra 125 63.5 20
Smith et al¹² 2005 Multi Retrospective Merci 151 67 20
Smith et al¹⁶ 2008 Multi Retrospective Merci 164 68 19
Struffert et al⁴¹ 2009 Single Prospective Penumbra 15 60.3 14
Tarr et al⁴² 2010 Multi Prospective Penumbra 157 65 18.1
Note:—Multi indicates multiple; Ret stent, retrievable stent.

Author	Year	Centers	Design	Device Used	Size (Patients)	Mean Age (yr)	Median NIHSS Score
Aleu et al²¹	2011	Single	Retrospective	Ret stent	54	68	19
Castaño et al²⁴	2010	Single	Retrospective	Ret stent	20	65.6	19
Devlin et al³⁷	2007	Single	Retrospective	Merci	25	63	18
Frei et al¹⁸	2011	Multi	Prospective	Penumbra	53	63	18
Grunwald et al³⁸	2009	Single	Retrospective	Penumbra	29	58.4	20
Kang et al²⁵	2011	Multi	Retrospective	Penumbra	22	59	18.1
Kulcsár et al²⁶	2010	Single	Prospective	Penumbra	27	66	14
Lee et al³⁹	2009	Single	Retrospective	Merci	17	67	18
Menon et al²³	2011	Single	Prospective	Penumbra	27	61.5	18
Menon et al⁴⁰	2012	Single	Prospective	Ret stent	14	62.1	14
Pereira et al²²	2011	Single	Prospective	Ret stent	25	66.3	18.7
Penumbra Pivotal Stroke Trial Investigators¹³	2009	Multi	Retrospective	Penumbra	125	63.5	20
Smith et al¹²	2005	Multi	Retrospective	Merci	151	67	20
Smith et al¹⁶	2008	Multi	Retrospective	Merci	164	68	19
Struffert et al⁴¹	2009	Single	Prospective	Penumbra	15	60.3	14
Tarr et al⁴²	2010	Multi	Prospective	Penumbra	157	65	18.1