Search engine and percentage incidence of hits including at least one ‘extra’ side effect when compared with the combined “Gold Standard” list
| AOL | DuckDuckGo | Yahoo | Ask | Ecosia | Dogpile | Bing | Yandex | Mean average | ||
| Hit incidence per 10 websites | 30% | 30% | 20% | 40% | 10% | 10% | 10% | 20% | 30% | 22.2% |