SLC18A2 and tic disorder: The average CGI-I for tics was 1.82 (±1.25) while the average CGI-I amongst VMAT2 inhibitors used for other conditions were chorea 1.65 (±0.88), dystonia 1.84 (±1.12), stereotypy 2.05 (±1.27) and tardive dyskinesia 2 (±2).