Search engine and incidence of ‘extra’ side effects when compared with the combined “Gold Standard” list
| AOL | DuckDuckGo | Yahoo | Ask | Ecosia | Dogpile | Bing | Yandex | Total | ||
| Total (mean per 10 websites) | 5 (0.5) | 5 (0.5) | 3 (0.3) | 13 (1.3) | 2 (0.2) | 2 (0.2) | 3 (0.3) | 7 (0.7) | 15 (1.5) | 55 |