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Priori power calculations were conducted based on expected effect sizes from previous studies of tobacco warning interventions, suggesting that a sample of approximately 600 participants would be sufficient to detect medium effects (power=0.80, =0.05)

The data set included 215,000 respondents from eight different surveys from the U.S., the U.K., Australia and New Zealand from the Global Health Data Exchange

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You'll hear and feel little "pops" as the hidden clips release

The research was carried out by Professor Kate Pickett, at the department of health sciences at Hull York medical school, University of York