A team of researchers from Stanford, Yale, GreenVoice, and Innovations for Poverty Action, conducted a study in Bangladesh with the goal understanding how to encourage mask-wearing behavior. The study was inspired when Mushfiq Mobarak, an economics professors at Yale University, observed that its citizens were continuing to not wear masks despite high population densities and a weak health care system. The team of researchers explored various mask intervention strategies among a population of 300 villages and compared their results with 300 villages that received no intervention at all. The experiment lasted for ten weeks. They discovered, to their astonishment, that mask-wearing tripled from 13% to 42% in the treatment villages. Even more, citizens continued to wear masks after interventions removed. "Even after 10 weeks, after we finished everything, the mask-wearing persisted. That's what got us excited," Mobarak said. The most effective strategies were making masks freely available paired with frequent reminders. Reminders include behavioral reinforcement in person and in public, offering more information, and modeling by local leaders. Efforts are being made to scale up the findings from the research study in nations such as India, Mexico, Nepal, and Pakistan.

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