Table 1. Means of frontal vertebral rotation.

		Reader 1	Reader 2	absolute difference
R T1	Mean ± SD	3.7 ± 3.50	3.7 ± 3.19	2.0 ± 1.92
R T2	Mean ± SD	5.0 ± 4.81	4.7 ± 4.25	2.2 ± 2.66
R T3	Mean ± SD	5.1 ± 5.28	4.7 ± 4.47	2.0 ± 2.69
R T4	Mean ± SD	6.2 ± 5.83	5.9 ± 5.52	1.7 ± 1.89
R T5	Mean ± SD	6.7 ± 6.53	6.8 ± 6.12	1.3 ± 1.26
R T6	Mean ± SD	6.4 ± 6.70	6.2 ± 6.12	1.4 ± 1.45
R T7	Mean ± SD	5.0 ± 5.52	5.0 ± 5.55	1.1 ± 1.06
R T8	Mean ± SD	4.2 ± 5.00	4.4 ± 4.77	1.0 ± 0.82
R T 9	Mean ± SD	4.1 ± 4.70	4.4 ± 4.50	1.1 ± 0.93
R T10	Mean ± SD	5.8 ± 5.37	5.6 ± 5.57	1.3 ± 1.24
R T11	Mean ± SD	6.7 ± 6.27	7.2 ± 6.28	1.5 ± 1.42
R T12	Mean ± SD	6.5 ± 6.23	7.0 ± 6.54	1.6 ± 1.54
R L1	Mean ± SD	5.8 ± 5.27	5.9 ± 5.35	1.7 ± 1.47
R L2	Mean ± SD	5.1 ± 5.05	5.5 ± 4.81	1.5 ± 1.35
R L3	Mean ± SD	5.6 ± 5.53	6.2 ± 5.51	1.4 ± 1.30
R L4	Mean ± SD	6.0 ± 5.09	6.2 ± 4.81	1.0 ± 0.76
R L5	Mean ± SD	4.1 ± 2.99	4.1 ± 3.52	1.4 ± 1.42

The mean ± SD of the vertebral rotation (R) in the frontal view was calculated on every level (RT1- RL5) for each reader. In addition the absolute difference was determined.