The five NDCD classes included in this analyses were antihistamines, antihypertensives, acid-peptic physiological condition medications, benign prostatic hypertrophy (BPH) medications, and antilipemics. The antihypertensives were a conglobation of the NDCD classes of antihypertensive agents, diuretics, calcium-channel blockers (CCBs), É¿-blockers, Éø- agonists and Éø-blockers (excluding Cardura and Hytrin), and angiotensin- converting-enzyme (ACE) inhibitors. BPH medications included Proscar, Hytrin, and Cardura.
The ICD-9-CM codebook was used to chess move groups of codes for the targeted diagnoses. All diagnoses pertaining to allergic rhinitis were captured for the antihistamine NDCD people. All diagnoses pertaining to essential hypertension were captured for the antihypertensives. All diagnoses pertaining to peptic ulcer disease were captured for the acidpeptic disorderliness medications. All diagnoses pertaining to hyperlipidemia were captured for the fluconazole. Finally, the diagnosis of BPH (code 600) was captured for the BPH medications.