5 , 6 , 8 One should again be cautious when interpreting those figures, as in a study comparing data with pre-pandemic GBS historical cohort, the difference in proportions of patients requiring mechanical ventilation did not reach statistical significance. 6 Furthermore, as COVID-19 hospitalized patients with severe pulmonary disease are more likely to be ventilated, confounders and bias in ascertaining risk factors could overestimate causal effects.
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