TABLE 2.

Interobserver Agreement Measured by Fleiss k (95% CI) in the Assessment of NCCN Resectability Status and Tumor-Vessel Contact, Among All Observers or Subgroups

Outcome Measures	All Observers	Volume ≥60 Resections/Year	Volume <60 Resections/Year	Surgeons	Radiologists
Resectability status
Resectability status	0.460 (0.459–0.460)	0.495 (0.494–0.496)	0.452 (0.451–0.452)	0.486 (0.486–0.487)	0.411 (0.410–0.412)
Resectable	0.555 (0.554–0.555)	0.602 (0.601–0.602)	0.540 (0.539–0.541)	0.579 (0.578–0.580)	0.506 (0.505–0.507)
Borderline resectable	0.282 (0.281–0.282)	0.314 (0.313–0.315)	0.281 (0.280–0.283)	0.302 (0.300–0.303)	0.232 (0.231–0.233)
Locally advanced	0.548 (0.548–0.549)	0.573 (0.572–0.574)	0.539 (0.538–0.541)	0.578 (0.577–0.579)	0.511 (0.510–0.512)
Tumor-venous contact
Superior mesenteric vein	0.427 (0.427–0.428)	0.428 (0.428–0.429)	0.458 (0.457–0.458)	0.436 (0.436–0.437)	0.392 (0.391–0.393)
Absent	0.420 (0.420–0.421)	0.414 (0.413–0.414)	0.452 (0.451–0.453)	0.424 (0.423–0.425)	0.383 (0.382–0.384)
≤180°	0.294 (0.294–0.295)	0.321 (0.321–0.322)	0.307 (0.306–0.308)	0.306 (0.305–0.307)	0.253 (0.252–0.254)
>180°	0.638 (0.637–0.638)	0.627 (0.626–0.628)	0.669 (0.668–0.670)	0.647 (0.646–0.648)	0.619 (0.618–0.620)
Main portal vein	0.505 (0.504–0.505)	0.499 (0.498–0.499)	0.551 (0.550–0.551)	0.495 (0.494–0.496)	0.491 (0.490–0.491)
Absent	0.568 (0.568–0.569)	0.569 (0.568–0.570)	0.585 (0.584–0.586)	0.559 (0.558–0.560)	0.556 (0.555–0.557)
≤180°	0.258 (0.258–0.259)	0.270 (0.269–0.271)	0.270 (0.269–0.271)	0.223 (0.222–0.224)	0.260 (0.259–0.261)
>180°	0.659 (0.659–0.660)	0.647 (0.646–0.648)	0.756 (0.755–0.757)	0.657 (0.656–0.658)	0.643 (0.632–0.644)
Tumor-arterial contact
Superior mesenteric artery	0.450 (0.449–0.450)	0.450 (0.449–0.451)	0.508 (0.507–0.509)	0.497 (0.497–0.498)	0.387 (0.386–0.388)
Absent	0.523 (0.523–0.524)	0.508 (0.507–0.509)	0.579 (0.578–0.581)	0.588 (0.587–0.589)	0.443 (0.442–0.444)
≤180°	0.297 (0.296–0.297)	0.318 (0.318–0.319)	0.352 (0.351–0.353)	0.311 (0.310–0.312)	0.261 (0.260–0.262)
>180°	0.528 (0.528–0.529)	0.560 (0.559–0.561)	0.556 (0.555–0.557)	0.558 (0.557–0.559)	0.494 (0.493–0.495)
Celiac axis	0.528 (0.528–0.529)	0.495 (0.494–0.496)	0.600 (0.599–0.601)	0.560 (0.559–0.561)	0.477 (0.477–0.478)
Absent	0.638 (0.637–0.638)	0.617 (0.616–0.618)	0.699 (0.698–0.700)	0.668 (0.667–0.669)	0.594 (0.593–0.595)
≤180°	0.249 (0.249–0.250)	0.255 (0.254–0.256)	0.277 (0.276–0.278)	0.265 (0.264–0.266)	0.197 (0.196–0.198)
>180°	0.592 (0.592–0.593)	0.527 (0.526–0.528)	0.663 (0.662–0.664)	0.629 (0.628–0.630)	0.539 (0.538–0.540)
Common hepatic artery	0.468 (0.467–0.468)	0.429 (0.428–0.430)	0.552 (0.551–0.553)	0.504 (0.503–0.505)	0.414 (0.414–0.415)
Absent	0.554 (0.554–0.555)	0.532 (0.531–0.533)	0.618 (0.617–0.619)	0.580 (0.579–0.581)	0.507 (0.506–0.508)
≤180°	0.254 (0.254–0.255)	0.228 (0.227–0.229)	0.336 (0.335–0.337)	0.309 (0.308–0.310)	0.196 (0.195–0.197)
>180°	0.508 (0.508–0.509)	0.462 (0.461–0.463)	0.578 (0.577–0.580)	0.522 (0.521–0.523)	0.476 (0.475–0.477)

CI indicates confidence interval.