[Table/Fig-15]:

Results of previous comparative studies.

Study/year	Number of patients	Average age	Average follow-up	Results
William E Ackerman et al., 2007 [31]	90	36.3 years	6 months	The transforaminal route of epidural steroid placement is more effective than the caudal or interlaminar route.
Ivan Rados et al., 2009 [32]	50	48.41 years	6 months	Both interlaminar and transforaminal techniques are equally effective.
Sergio Mendoza-Lattes et al., 2009 [33]	93	38.9 years	24 months	Both caudal and transforaminal techniques are equally effective.
Babita Ghai et al., 2014 [34]	62	44.4 years	12 months	Both interlaminar and transforaminal techniques are equally effective.
Nayyaamat Sandhu et al., 2014 [35]	40	42 years	3 months	Both caudal and interlaminar techniques are equally effective.
Laxmaiah Manchikanti et al., 2015 [36]	360	44.5 years	24 months	caudal, interlaminar, and transforaminal routes are equally effective.
Rodrigo Rezende et al., 2015 [37]	40	49 years	3 months	Transforaminal technique is more effective than interlaminar technique.
Serbülent Gökhan Beyaz et al., 2016 [38]	299	54.5 years	12 months	Both interlaminar and transforaminal technique are equally effective.
Seyed Masoud Hashemi et al., 2015 [39]	64	50	1 month	Both interlaminar and transforaminal technique are equally effective.
Present study	140	35.37 years	1 year	Transforaminal route was significantly more effective than caudal and interlaminar route.