Table 1

Inter- and Intraobserver Precision and Accuracy of Radiographic Range of Motion Measurement Using the Keel Method at Increasing Beam Angles

Comparison	Calculation	n	0°	5°	10°	15°	P
Interobserver precision^a	ROM observations 1 and 2 combined	16	24.7 ± 4.6	23.8 ± 3.4	24.1 ± 3.3	24.2 ± 3.9	.92
Intraobserver accuracy^a	ROM error observations 1 and 2 combined	16	4.3 ± 4.6	3.2 ± 3.3	3.8 ± 3.3	3.3 ± 3.9	.86
Interobserver precision^b	ROM observation 1 - ROM observation 2	8	2.0 (0.0 - 10.0)	3.0 (1.0 - 10.0)	1.5 (0.0 - 10.0)	1.0 (0.0 - 3.0)	.09
Intraobserver accuracy^b	ROM error observation 1 - ROM error observation 2	8	2.0 (0.0 - 10.0)	3.0 (0.2 - 10.0)	1.5 (0.0 - 9.4)	1.0 (0.0 - 3.0)	.07