Prescription antacids that were incorrectly reported in the nonprescription antacid section of the questionnaire were removed from the antacid file and added to the prescription medication file. Prescription medications that were incorrectly reported in the dietary supplement section were removed from that file and added to the prescription medication file. Any prescription dietary supplements and vitamin that was incorrectly reported in the prescription medication section was removed from the prescription medication section and moved to the dietary supplement section. These products are not included in any counts of prescription medications. Products reported in the prescription medication section that were only available as over-the-counter products during 1999-2000 were removed from the prescription medication file. The variables that record overall prescription drug use (RXD030) and number of prescription drugs taken (RXD295) were adjusted for products moved into or out of the prescription medication file.

Prescription antacids that were incorrectly reported in the nonprescription antacid section of the questionnaire were removed from the antacid file and added to the prescription medication file. Prescription medications that were incorrectly reported in the dietary supplement section were removed from that file and added to the prescription medication file. Any prescription dietary supplements and vitamin that was incorrectly reported in the prescription medication section was removed from the prescription medication section and moved to the dietary supplement section. These products are not included in any counts of prescription medications. Products reported in the prescription medication section that were only available as over-the-counter products during 1999-2000 were removed from the prescription medication file. The variables that record overall prescription drug use (RXD030) and number of prescription drugs taken (RXD295) were adjusted for products moved into or out of the prescription medication file.