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Table 2 Summary of linked prescriptions (pharmacy and GP database) for the two analyses: branded prescriptions that can be potentially substituted generically (generic substitution analysis) and generic prescriptions that can be potentially substituted by a branded product (branded substitution analysis)

From: Analyzing generic and branded substitution patterns in the Netherlands using prescription data

  Generic substitution analysis Branded substitution analysis
No. of linked prescriptions 17,204 36,695
No. of prescriptions (%) on:   
   • ACE inhibitors 6,068 (35.27) 10,259 (27.96)
   • Antidepressants 4,626 (26.9) 11,760 (32.04)
   • PPIs 3,788 (22.03) 8,187 (22.32)
   • Statins 2,721 (15.81) 6,491 (17.68)
Average prescription- delivery lag in days (SD) 0.48 (0.84) 0.41 (0.91)
Average duration after patent expiry in months (SD) 27.47 (12.83) 35.07 (19.84)
No. of pharmacies 26 26
Individual pharmacy a 18 19
Pharmacy in a partnership a 8 9
Pharmacy in a chain a 5 7
No. sample patients 1,423 3,855
Female patients (%) 819 (57.6) 2,215 (57.5)
Average age in years (SD) 61.05 (15.15) 57.96 (16.6)
  1. a Pharmacy ownership status can vary over time for each pharmacy
  2. SD = standard deviation