As for Samuel Brown, he mentions the âindication biasâ, which is the bias that occurs when the risk of an adverse event is related to the indication for medication use but not the use of the medication itself...
đ„Here is a thread about how the @nejm New York observational study was massaged in order to hide the significant benefit of Hydroxychloroquine (HCQ) for hospitalized patients that a closer look to data reveals. nejm.org/doi/full/10.10âŠ
Granted, the authors didnât hide the fact that the HCQ group was more severely ill.
Indeed, the patients from HCQ group were mostly already in a mild to moderate Acute Respiratory Distress Syndrome (ARDS) while the patients from the other group were not, as the PaO2/FiO2 shows: