Tag: false positives
There is no COVID-19 “casedemic.” The pandemic is real and deadly.
Antivaccine activists and pandemic minimizers Del Bigtree and Joe Mercola are promoting the myth of the "casedemic" that claims that the massive increase in COVID-19 cases being reported is an artifact of increased PCR testing and false positives due to too sensitive a threshold to the test. As they have done for vaccines and vaccine-preventable diseases many times before, they are vastly...
Corrigendum. The Week in Review for 04/09/2017
The NECSS is coming. Acupuncturists mimic chiropractic. Flu vaccine prevents death. In the UK they care more for cats than people. The problem is my middle burner, not too many burgers. And more.
Corrigendum. The Week in Review for 03/19/2017
What happened this week? Measles returns to kill. Stem cell injections blind. Lousy acupuncture studies. Fire hot. Skinny jeans are not a reason to see a chiropractor. Lesbian tendencies do not respond to homeopathy. And more.
Acupuncture and Migraine – New JAMA Study
Yet another poorly designed acupuncture study with dubious results is being presented as if it were compelling evidence.
The American Cancer Society’s new mammography guidelines: Déjà vu all over again
One of the things that feels the weirdest about having done the same job, having been in the same specialty, for a longer and longer time is that you frequently feel, as the late, great Yogi Berra would have put it, déjà vu all over again. This is particularly true in science and medicine, where the same issues come up again and...
Why False Positive Results Are So Common In Medicine
Have you ever been surprised and confused by what seem to be conflicting results from scientific research? Have you ever secretly wondered if the medical profession is comprised of neurotic individuals who change their mind more frequently than you change your clothes? Well, I can understand why you’d feel that way because the public is constantly barraged with mixed health messages. But why...
Screening Tests – Cumulative Incidence of False Positives
It’s easy to think of medical tests as black and white. If the test is positive, you have the disease; if it’s negative, you don’t. Even good clinicians sometimes fall into that trap. Based on the pre-test probability of the disease, a positive test result only increases the probability by a variable amount. An example: if the probability that a patient has...