J. Med. Internet Res. - Using Google AdWords for international multilingual recruitment to health research websites.


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CKGROUND: Google AdWords, the placement of sponsored links in Google search results, is a potent method of recruitment to Internet-based health studies and interventions. However, the performance of Google AdWords varies considerably depending on the language and the location of the target audience.OBJECTIVE: Our goal was to describe differences in AdWords performance when recruiting participants to the same study conducted in four languages and to determine whether AdWords campaigns can be optimized in order to increase recruitment while decreasing costs.METHODS: Google AdWords were used to recruit participants to the Mood Screener, a multilingual online depression screening tool available in English, Russian, Spanish, and Chinese. Two distinct recruitment periods are described: (1) "Unmanaged", a 6-month period in which ads were allowed to run using only the AdWords tool itself, with no human intervention, and (2) "Managed", a separate 7-week period during which we systematically sought to optimize our recruitment campaigns.RESULTS: During 6 months of unmanaged recruitment, our ads were shown over 1.3 million times, resulting in over 60,000 site visits. The average click-through rate (ratio of ads clicked to ads displayed) varied from 1.86% for Chinese ads to 8.48% for Russian ads, as did the average cost-per-click (from US $0.20 for Chinese ads to US $0.50 for English ads). Although Chinese speakers' click-through rate was lowest, their rate of consenting to participate was the highest, at 3.62%, with English speakers exhibiting the lowest consent rate (0.97%). The conversion cost (cost to recruit a consenting participant) varied from US $10.80 for Russian speakers to US $51.88 for English speakers. During the 7 weeks of "managed" recruitment, we attempted to improve AdWords' performance in regards to the consent rate and cost by systematically deleting underperforming ads and adjusting keywords. We were able to increase the number of people who consent after coming to the site by 91.8% while also decreasing per-consent cost by 23.3%.CONCLUSIONS: Our results illustrate the need to linguistically and culturally adapt Google AdWords campaigns and to manage them carefully to ensure the most cost-effective results.

Resumo Limpo

ckground googl adword placement sponsor link googl search result potent method recruit internetbas health studi intervent howev perform googl adword vari consider depend languag locat target audienceobject goal describ differ adword perform recruit particip studi conduct four languag determin whether adword campaign can optim order increas recruit decreas costsmethod googl adword use recruit particip mood screener multilingu onlin depress screen tool avail english russian spanish chines two distinct recruit period describ unmanag month period ad allow run use adword tool human intervent manag separ week period systemat sought optim recruit campaignsresult month unmanag recruit ad shown million time result site visit averag clickthrough rate ratio ad click ad display vari chines ad russian ad averag costperclick us chines ad us english ad although chines speaker clickthrough rate lowest rate consent particip highest english speaker exhibit lowest consent rate convers cost cost recruit consent particip vari us russian speaker us english speaker week manag recruit attempt improv adword perform regard consent rate cost systemat delet underperform ad adjust keyword abl increas number peopl consent come site also decreas percons cost conclus result illustr need linguist cultur adapt googl adword campaign manag care ensur costeffect result

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