It's called the "number needed to treat," or NNT. As Aaron Carroll explains below, it's how many people need to take a particular treatment for one of them to receive the advertised benefit. For example, if we imagine a treatment for the common cold with an NNT of 5, that means for every person whose cold was successfully treated, 4 people took the medicine for no benefit.
Sounds simple, right? What's amazing is just how high this number can be. Even very famous and well-accepted treatments often have NNTs in the hundreds or thousands. Watch the video for the full explanation. --Ryan Cooper
Subscribe to The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.
Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
Create an account with the same email registered to your subscription to unlock access.
-
Why is Tesla stumbling?In the Spotlight More competition, confusion about the future and a giant pay package for Elon Musk
-
How Taylor Swift changed copyright negotiations in musicunder the radar The success of Taylor's Version rerecordings has put new pressure on record labels
-
Job scams are increasingly common. Here's what to look out for.The Explainer You should never pay for an application or give out your personal info before being hired
-
Puffed rice and yoga: inside the collapsed tunnel where Indian workers await rescueSpeed Read Workers trapped in collapsed tunnel are suffering from dysentery and anxiety over their rescue
-
More than 2,000 dead following massive earthquake in MoroccoSpeed Read
-
Mexico's next president will almost certainly be its 1st female presidentSpeed Read
-
North Korea's Kim to visit Putin in eastern Russia to discuss arms sales for Ukraine war, U.S. saysSpeed Read
-
Gabon's military leader sworn in following coup in latest African uprisingSpeed Read
-
Nobody seems surprised Wagner's Prigozhin died under suspicious circumstancesSpeed Read
-
Western mountain climbers allegedly left Pakistani porter to die on K2Speed Read
-
'Circular saw blades' divide controversial Rio Grande buoys installed by Texas governorSpeed Read
