Figure 1.

CDI analysis. L1 and L2 were defined as the maximal length between the anterior and posterior walls. This length is the distance of the perpendicular line drawn from the most anterior border of the fourth rib bone to the most posterior point of the chest wall. A CDR was analyzed to measure the change in AP length. Pre- and post-CDR were defined as L2/L1 and L2’/L1’, respectively. CDI was defined as post-CDR/pre-CDR to correct for natural differences between both chest walls. CDR, chest wall deformity ratio; CDI, chest wall deformity index; AP, antero-posterior.