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Table 4: Inadequate block and false-negative rate of diagnostic selective nerve root block
Inadequate Block Results of DSNRB False-Negative Rate PValue (Fisher Exact Test)
False-Negative True-Positive
Present 10 2 83% (10/12) .002
Absent 10 25 29% (10/35) 
Note:—DSNRB indicates diagnostic selective nerve root block.

Inadequate Block	Results of DSNRB		False-Negative Rate	PValue (Fisher Exact Test)
Inadequate Block	False-Negative	True-Positive	False-Negative Rate	PValue (Fisher Exact Test)
Present	10	2	83% (10/12)	.002
Absent	10	25	29% (10/35)