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Table 2: 
Relationship between needle-tip location and contrast distribution
Needle-Tip LocationP Value
Foraminal ZoneJunctionalExtra-Foraminal
Intraforaminal contrast
    Present30357<.001
    Absent0117
Central epidural contrast
    Present840.01
    Absent223224
Extraforaminal contrast
    Present273422.79
    Absent322