Park Avenue Chiropractic 

This 1988 Utah workers’ compensation board study found a tenfold savings for mean compensation cost in back-related injuries treated by chiropractors as compared with medical doctors ($68.38 vs. $668.39). To ensure accurate and true results, only those back-related injuries with the same diagnostic codes were compared between the two groups. Also, medical treatments assessed were limited to non-surgical treatments only.
Cost per Case Comparison of Back Injury Claims of Chiropractic versus medical Management for Conditions with Identical Diagnostic Codes. Jarvis KB et al. Journal of Occupational Medicine – 1991; 33:847-52.

In this study, Richard Wolf, MD followed 500 individuals sent for chiropractic treatment and 500 individuals sent for medical treatment. Those who received chiropractic treatment returned to work in an average of 15.6 days vs. 32 days for those who received medical treatment.
Industrial Back Injury.Wolf CR. International Review of Chiropractic- 1974;26:6-7.