In both study groups , baclofen augmented lower oesophageal sphincter ( LES ) pressure ( HVs : +7.3 1.8 mmHg , P < 0.0001 , GERD : +4.50 1.49 mmHg , P < 0.003 ) and increased LES length ( HVs : +0.48 0.11 cm , P < 0.0003 , GERD : +0.35 0.06 cm , P < 0.0001 ) .