Table 3. Comparison of Contrast Medium Spread between Ipsilateral and Contralateral Sides Following 3-ml Contrast Medium Injection: Anteroposterior Image.

Dates are expressed as number of levels and are presented as median (interquartile range). Group C: total of 3 ml contrast medium spread in thoracic transforaminal epidural block. ^*In cephalad spread, the difference between ipsilateral and contralateral side is significant (P < 0.05) and the direction is contralateral < ipsilateral. ^†In caudal direction, the difference between ipsilateral and contralateral side is significant (P < 0.01) and the direction is contralateral < ipsilateral. ^‡In total spread, the difference between ipsilateral and contralateral is significant (P < 0.001) and the direction is contralateral < ipsilateral.