No, according to the New York Times, the Monster Study showed no effect of the intervention on stuttering. Telling children that they should worry about stuttering did cause them to act like stutterers (eg, refusing to talk), but it did not cause stuttering. Similarly, telling children not to worry about stuttering had no effect on their stuttering. It does not address whether it affected their nervousness.
No, according to the New York Times, the Monster Study showed no effect of the intervention on stuttering. Telling children that they should worry about stuttering did cause them to act like stutterers (eg, refusing to talk), but it did not cause stuttering. Similarly, telling children not to worry about stuttering had no effect on their stuttering. It does not address whether it affected their nervousness.