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Table 3 Summary of median price ratios (MPR) of the surveyed over-the-counter medicines in retail pharmacies

From: Evaluating availability and price of essential medicines in Boston area (Massachusetts, USA) using WHO/HAI methodology

3(a). All Medicines analysis
  Overall Chain Pharmacies Independent Pharmacies
  Originator Brand
(medicines = 9)
Lowest Price Generic
(medicines = 11)
Originator Brand
(medicines = 9)
Lowest Price Generic
(medicines = 11)
Originator Brand
(medicines = 9)
Lowest Price Generic
(medicines = 9)
Median MPR 21.33 11.53 20.81 11.53 17.98 9.43
Minimum, Maximum MPR 11.41, 41.24 2.68, 29.42 11.41, 143.13 2.68, 112.08 11.69, 37.27 2.55, 31.58
3(b). Matched pair analysis
  Originator Brand Lowest Price Generic Originator Brand Lowest Price Generic Originator Brand Lowest Price Generic
OB-LPG pairs = 9 OB-LPG pairs = 9 OB-LPG pairs = 8
Median MPR 21.33 14.56 20.81 15.81 17.81 9.50
Minimum, Maximum MPR 11.41, 41.24 5.40, 29.42 11.41, 143.13 5.79, 112.08 11.69, 35.15 3.55, 31.58
  1. In 'all medicines' analysis, the overall median MPRs for the originator brand (OB) and lowest price generic (LPG) versions of the over-the-counter (OTC) medicines were marginally different (p-value = 0.056). In chain pharmacies, the median MPRs of the OB and LPG versions were not statistically different (p-value = 0.11). Whereas in the independent pharmacies, the median MPRs of the OB and LPG were statistically different (p-value = 0.004). Furthermore, the median MPRs of the OB version of OTC medicine in chain pharmacy were not statistically different (p-value = 0.96) from that in the independent pharmacy. Similarly, the median MPRs of the LPG versions were marginally different (p-value = 0.503) among the chain and independent pharmacies.
  2. In 'matched pair' analysis, the overall median MPRs of the OB and LPG versions of OTC medicines were statistically different (p-value = 0.03). Within both chain and independent pharmacies, the median MPRs of the OB and LPG versions of OTC medicines were statistically different (chain p-value = 0.008; independent p-value = 0.03) from each other