Table 1.

Intraobserver study of observed Cobbs’ angle differences using 30 × 90 cm radiographs

	N	Minimum	Maximum	Mean	SD deviation
Observer 1	40	0	13.00	1.7750	2.29255
Observer 2	40	0	10.00	2.4000	2.03558
Observer 3	40	0	15.00	2.0250	2.55692
Observer 4	40	0	10.00	3.0750	2.69270
Observer 5	40	0	5.00	1.5500	1.15359
Observer 6	40	0	14.00	2.5500	2.92601
Observer 7	40	0	9.00	1.9500	2.07488
Observer 8	40	0	9.00	2.3750	2.13262