Comparison	Studies	N for comparison	Result	GRADE CRITERIA					RATING
				LIMITATIONS	INCONSISTENCY	INDIRECTNESS	IMPRECISION	PUBLICATION BIAS
LASB vs placebo	Price 1998 Aydemir 2006	23	No difference	—	—	—	X	—	Moderate
Thoracic LASB + steroid vs subcutaneous	Rocha 2014	36	1 month –clinically important difference (not sig).	X	X	—	X	—	Very low
			1 year clinically important difference (sig)	X	X	—	X	—
LASB vs ultrasound block	Aydemir 2006	18	No difference	—	X	—	X	—	Low
LASB vs IVRB guanethidine	Bonelli 1983	19	No difference	X	X	—	X	—	Very low
LASB vs BTA	Carroll 2009	9	Increased duration of relief with BTA		X	—	X	—	Low
LASB vs pulsed radiofrequency	Freitas 2013	40	No difference	X	X	—	X	—	Very low
LASB vs oral corticosteroids	Lim 2007	38	No difference	X	X	X	X	—	Very low
LASB vs IVRB (both lidocaine + clonidine)	Nascimento 2010	43	No difference	X	X	—	X	—	Low
LASB + PT + pharma vs PT + pharma	Rodriguez 2005	82	Favours SGB	X	X	—	X	—	Very low
LASB+ vs PT	Zeng 2003	60	No difference	X	X	—	X	—	Very low
Continuous LASB vs continuous brachial plexus block	Toshniwal 2012	33	Favours brachial plexus block	—	X	—	X	—	Low
Image‐guided LASB vs nonimage‐guided	Yoo 2012	42	No difference	X	X	X	X	—	Very low