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Statistical analysis of extracted data with outliers removed.
| Form of distribution analysis | Number recruited |
Recruitment length (months) |
Impressions (millions) |
Cost per ad click (US $) |
Conversion rate (%) | Eligibility (%) | Cost per participant (US $) |
| Mean | 463 | 5.13 | 12.9 | 0.57 | 7 | 65 | 19.77 |
| Median | 264 | 3.00 | 3.3 | 0.51 | 4 | 61 | 14.41 |
| Interquartile range | 775 | 8.00 | 16.6 | 0.28 | 6 | 39 | 10.66 |
