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. 2013 Feb 11;6:58. doi: 10.1186/1756-0500-6-58

Table 2.

Percentage position on the distance C7 to PSIS

Variable Value Lower limit Upper limit
C7-PSIS
100%
 
 
T4
21.0%
20.0%
21.9%
T7
39.0%
38.0%
40.0%
T10
54.1%
52.8%
55.4%
L1
70.9%
69.5%
72.3%
L4 86.1% 85.0% 87.2%

Table 2 (values are means, limits are 95% confidence limits according to a t-distribution with 21 degrees of freedom), C7-PSIS = distance between spinal process of the seventh cervical vertebrae and the posterior superior iliac spine, T4, T7, T10, L1 and L4 = spinal process of the fourth, seventh and tenth thoracic, and first and fourth lumbar vertebrae.