Table 2.

Perceived accuracy assessment by peripheral nerve block. FNr, false-negative rate; FPr, false-positive rate; TNr, true-negative rate; TPr, true-positive rate.

Peripheral nerve block	True positive		True negative		False positive		False negative		Accuracy (TPr+TNr)	Total structures
	TPr	Structures	TNr	Structures	FPr	Structures	FNr	Structures
Interscalene-level brachial plexus block	0.908	139	0.033	5	0.013	2	0.046	7	0.941	153
Upper-trunk block	0.896	69	0.013	1	0.052	4	0.039	3	0.909	77
Supraclavicular-level brachial plexus block	0.958	226	0.025	6	0.008	2	0.008	2	0.983	236
Axillary-level brachial plexus block	0.951	366	0.026	10	0.003	1	0.021	8	0.977	385
Erector spinae plane block	0.638	97	0.250	38	0.000	0	0.112	17	0.888	152
Rectus sheath block	0.968	149	0.000	0	0.032	5	0.000	0	0.968	154
Suprainguinal fascia iliaca block	0.702	106	0.060	9	0.219	33	0.020	3	0.762	151
Adductor canal block	0.872	136	0.032	5	0.000	0	0.096	15	0.904	156
Popliteal-level sciatic nerve block	0.875	140	0.106	17	0.006	1	0.013	2	0.981	160
Average/total	0.879	1428	0.056	91	0.030	48	0.035	57	0.935	1624