<qa>  What was the allocation ratio for patients?Screening assessments were done within 2 weeks of scheduled procedures. After completion of preprocedural sedation assessments, patients were randomly assigned to 1 of the 2 treatment groups at a 3:1 AQUAVAN: midazolam allocation ratio on the day of the scheduled procedure Day 0 via an Interactive Voice Response System IVRS. Randomization was stratified by site. 