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The radial BP signal was calibrated twice during each 5 minute-period of recording by brachial BP measurements from the contralateral arm

Because we are looking at impact to health , we aren't measuring something precise to begin with

For example, the joint effect of two dichotomous exposures E 1 and E 2 (coded 1 = exposure present, 0 = exposure absent) on the rate ratio is the product of their singular effects: Hence the term multiplicative model

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Raise customer awareness: Customers must be made aware of the acute health and safety risks posed by counterfeit e-cigarettes