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question archive Types of Study Designs: Ecologic, Cross Sectional, Case-Control, Cohort, Quasi-Experimental, True Experimental

Types of Study Designs: Ecologic, Cross Sectional, Case-Control, Cohort, Quasi-Experimental, True Experimental

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Types of Study Designs: Ecologic, Cross Sectional, Case-Control, Cohort, Quasi-Experimental, True Experimental.

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  1. In their investigation of the impact of telework on risk for COVID-19 infection, Fisher et al. found that a lower percentage of people with positive COVID-19 test results reported teleworking during the 2 weeks before symptom onset, as compared with people who had negative test results. All participants were symptomatic and had been identified from outpatient health care facilities.

Study design

  1. In a blinded, placebo-controlled randomized study conducted at 34 hospitals in the US, adults hospitalized with respiratory symptoms from COVID-19 infection were randomly assigned to hydroxychloroquine or placebo. At 14 days after randomization, clinical status did not significantly differ between the hydroxychloroquine and placebo groups. At 28 days, 25 of 241 patients (10.4%) in the hydroxychloroquine group and 25 of 236 (10.6%) in the placebo group had died.

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