Table 3.
The calculation of the probability of the online procurement of eye drops.
| Active pharmaceutical ingredients | Number of links in the first 50 Google search results and the product availability point (divided by 20) | Availability category 1 = high accessibility 0.5 = medium accessibility 0.25 = low accessibility |
Average price of products available and online internet market affordability point | Affordability category 1 = low price range 0.5 = medium price range 0.25 = high price range |
Total weighted probability of online purchase | Probability category 0–0.25 = low 0.25–0.75 = medium 0.75–1.0 = high |
||
|---|---|---|---|---|---|---|---|---|
| Betaxolol | 15 | 0.75 | 1 | >$50 | 0 | 0.25 | 0.25 | Low |
| Brinzolamide | 15 | 0.75 | 1 | $25–50 | 0.5 | 0.5 | 0.5 | Medium |
| Ciprofloxacin | 4 | 0.2 | 0.25 | <$25 | 1 | 1 | 0.25 | Low |
| Sodium cromoglicate | 11 | 0.55 | 0.5 | <$25 | 1 | 1 | 0.5 | Medium |
| Cyclopentolate | 4 | 0.2 | 0.25 | >$50 | 0 | 0.25 | 0.0625 | Low |
| Tetryzoline & antazoline | 4 | 0.2 | 0.25 | $25–50 | 0.5 | 0.5 | 0.125 | Low |
| Tetryzoline | 4 | 0.2 | 0.25 | $25–50 | 0.5 | 0.5 | 0.125 | Low |
| Timolol & dorzolamide | 20 | 1 | 1 | <$25 | 1 | 1 | 1 | High |
| Timolol & latanoprost | 3 | 0.15 | 0.25 | <$25 | 1 | 1 | 0.25 | Low |
| Travoprost | 7 | 0.35 | 0.5 | $25–50 | 0.5 | 0.5 | 0.25 | Low |