Official Counselor I’ll Be There For You From 6ft Away Shirt
How many positives and negatives are presented at a time? (This is mentioned for training, but not for the trial itself.) Are there trials when no positive sample is presented, or multiple positive samples? These questions are absolutely crucial in determining whether the study design itself is flawed and biased. The sample size is not nearly as large as it appears. While the number of samples prepared was 10,388 "sample presentations", samples from only 7 infected patients and 7 noninfected patients were used! Samples from the same patients were reused multiple times for all of these sample presentations. It is quite likely that some other confounding variable with a particular patient or patients is what the dogs are detecting, rather than the presence of COVID, since only samples from 7 patients were used in each arm.
Nhận xét
Đăng nhận xét