. Author manuscript; available in PMC: 2015 Apr 1.

Published in final edited form as: Pediatr Radiol. 2013 Dec 10;44(4):457–466. doi: 10.1007/s00247-013-2837-4

Table 4.

Observer agreement on vertebral fracture diagnosis

Intraobserver Agreement
		Radiologist 1	Radiologist 2	Radiologist 3
Vertebral Level	Agreement (95 % CI)	98 (97, 99)	97 (96, 98)	96 (95, 97)
	κ (95% CI)	0.726 (0.620, 0.833)	0.668 (0.566, 0.771)	0.529 (0.402, 0.655)
	Weighted κ	0.731 (0.637, 0.826)	0.678 (0.597, 0.758)	0.632 (0.531, 0.733)
Patient Level	Agreement (95% CI)	92 (87, 97)	89 (83, 95)	84 (77, 91)
	κ (95% CI)	0.767 (0.612, 0.922)	0.642 (0.443, 0.842)	0.528 (0.316, 0.740))
	Weighted κ	0.766 (0.637, 0.895)	0.778 (0.639, 0.917)	0.678 (0.515, 0.841)
Interobserver Agreement
		Radiologist 1 vs. 2	Radiologist 1 vs. 3	Radiologist 2 vs. 3
Vertebral Level	Agreement (95 % CI)	97 (96, 97)	96 (95, 97)	96 (95, 96)
	κ^a (95% CI)	0.532 (0.430, 0.633)	0.455 (0.348, 0.562)	0.548 (0.461, 0.635)
	Weighted κ	0.531 (0.452, 0.610)	0.481 (0.393, 0.570)	0.568 (0.496, 0.641)
Patient Level	Agreement (95% CI)	85 (80, 90)	82 (76, 87)	82 (76, 87)
	κ (95% CI)	0.486 (0.310, 0.661)	0.433 (0.261, 0.605)	0.470 (0.308, 0.631)
	Weighted κ	0.573 (0.434, 0.713)	0.525 (0.384, 0.666)	0.592 (0.457, 0.728)

CI confidence interval, K Cohen’s kappa, vertebral level indicates determination of whether individual vertebrae were fractured, patient level indicates determination of whether a patient had one or more vertebral fractures