GRED causes Sagittal spinal deformities. In this research, the researchers have taken 190 patients suffering from spinal disorders and have undergone whole spine X-Ray in sagittal and coronal planes. They have examined those patients thoroughly to find out the relationship between radiographic parameters and GRED symptoms. They have given negative values to the right convex coronal curves. They have set a certain parameter for or lumber cobb angle when degenerative scoliosis was identified. The angle parameter should be greater than 10 degrees. 

As a result of the study, degenerative scoliosis at the lumbar spine was found in 126 patients. Among them, 42 patients were with a right convex curve, and the remaining 84 patients were with the left convex curve. The rest 59 patients had GRED. Therefore it has been revealed that the lumbar cobb angle was completely associated with GRED. When the researchers categorized the patients based on the cobb angle of the lumbar curve, it was found that the majority of the left convex curves were strongly associated with GRED.

Therefore the study has come to your conclusion stating the left lumbar curve is a very important risk factor for GRED. This risk could be increased when the curve is greater than 30 degrees. Therefore while treating old people with degenerative scoliosis the doctors must consider organ disorders like GRED.

Ref: https://journals.lww.com/jspinaldisorders/Fulltext/2017/05000/Scoliosis_is_a_Risk_Factor_for_Gastroesophageal.34.aspx?WT.mc_id=HPxADx20100319xMP