"The less control people had over their work, the higher their blood pressure during work hours. Moreover, blood pressure at home was unrelated to the level of job control, indicating that the spike during work hours was specifically caused by lack of choice on the job. People with little control over their work also experienced more back pain, missed more days of work due to illness in general, and had higher rates of mental illness-the human equivalent of stereotypies, resulting in the decreased quality of life common to animals reared in captivity."