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Caveats : Limitations to this study included the small sample size and use of data from only one hospital . This study examined 15 counties in the Chesapeake Bay watershed and 15 counties outside the Chesapeake Bay watershed , and considered opportunity costs ( loss of income from livestock or crop production ) , installation and annual maintenance costs , and transaction costs ( cost to the farmer in time required to enroll in the program , create a management plan , etc. ) . I had seen part of this studying fluid mechanics . In this study , functional ratings had only limited usefulness for predicting long-term employment outcome after traumatic brain injury . This study collected and looked at 158 reports and concluded that self-reporting is an easily implementable addition to the more traditional methods used for quality improvement within general medicine . However , this study involved far too few women to tell us if combination therapy is indeed superior to AZT alone .