Table 2.

Human–human (H-H) and human–artificial intelligence (H-AI) annotation comparisons by structure.

Comparisons by block and structure (Dice metric)
Structure	Min	Mean	Median	Max	sd
Interscalene block
C5 & C6
-H-H	0.00	0.60	0.63	0.87	0.18
-H-AI	0.02	0.54	0.52	0.87	0.15
Anterior scalene
-H-H	0.00	0.70	0.80	0.96	0.26
-H-AI	0.00	0.73	0.75	0.95	0.20
Middle scalene
-H-H	0.00	0.67	0.75	0.95	0.25
- H-AI	0.00	0.70	0.75	0.94	0.19
Axillary brachial plexus
Axillary artery
-H-H	0.00	0.85	0.88	0.96	0.14
-H-AI	0.00	0.84	0.85	0.96	0.11
Median nerve
-H-H	0.00	0.44	0.51	0.86	0.26
-H-AI	0.00	0.42	0.52	0.94	0.34
Musculocutaneous nerve
-H-H	0.00	0.50	0.65	0.94	0.34
-H-AI	0.00	0.38	0.53	0.84	0.32
Radial nerve
-H-H	0.00	0.21	0.00	0.94	0.30
-H-AI	0.00	0.27	0.24	0.74	0.25
Ulnar nerve
-H-H	0.00	0.31	0.06	0.94	0.36
- H-AI	0.00	0.31	0.22	0.84	0.30
Erector spinae plane block
ES muscle group
-H-H	0.00	0.81	0.92	0.98	0.25
- H-AI	0.00	0.62	0.75	0.95	0.36
Rectus sheath block
Rectus abdominis
-H-H	0.75	0.92	0.93	0.98	0.04
- H-AI	0.65	0.87	0.91	0.97	0.08
Adductor canal block
Femoral artery
-H-H	0.74	0.90	0.90	0.97	0.04
-H-AI	0.73	0.88	0.89	0.96	0.05
Saphenous nerve
-H-H	0.00	0.51	0.56	0.92	0.26
-H-AI	0.00	0.36	0.50	0.84	0.30
Sartorius
-H-H	0.00	0.91	0.94	0.98	0.14
- H-AI	0.01	0.92	0.93	0.97	0.10
Sciatic nerve block
Sciatic nerve
-H-H	0.31	0.78	0.82	0.96	0.13
- H-AI	0.04	0.60	0.66	0.93	0.28
Axillary brachial plexus
Fascia over conjoint tendon
-H-H	0.00	0.08	0.03	0.67	0.12
- H-AI	0.00	0.23	0.16	1.00	0.25
Erector spinae plane block
Transverse process
-H-H	0.00	0.05	0.01	0.67	0.09
- H-AI	0.00	0.01	0.00	0.17	0.03
Rectus sheath block
Rectus sheath
-H-H	0.00	0.09	0.05	0.68	0.10
-H-AI	0.00	0.10	0.04	0.97	0.17
Peritoneum
-H-H	0.00	0.09	0.03	1.00	0.17
-H-AI	0.00	0.30	0.29	0.97	0.19