In 1987, a study of 17,142 patients (22 clinics) in Italy by medical physicians and chiropractors concluded:

"The results of our survey presented herein, are clear and incontrovertible: our sample population of over seventeen thousand patients treated with chiropractic for at least two years showed that this treatment could lead to 55-75% reduction in the number of daily absences from work and could cut down the number of hospitalized patients by 87.60 % vis-à-vis other currently used forms of treatment (pharmacological, physiokinesiotherapeutic, surgical, etc.)....... 

A most meaningful indicator of the effectiveness of chiropractors is the improvement it produces in the quality of life, not only because of its curative effect but also thanks to its preventative and rehabilitative functions."