Carpal tunnel syndrome, a nerve disorder that affects the hands and wrists, is often caused by repetitive motions such as typing on a keyboard. A recent study of office workers found that, among those who do similar amounts of typing, workers reporting the least control over their own work had almost three times the risk of developing carpal tunnel syndrome as did those who reported the most control.
The statement 'Among office workers who rarely use keyboards, the rate of carpal tunnel syndrome is much higher for those who feel that they lack control over their own work' most helps to explain the study's findings.