The findings show that the presumptive guidelines were successful over the long term in reducing incarceration rates in the county studied. Also, the average length of imprisonment for the sample dropped immediately after the guidelines became effective; however, the mean sentence length returned to the preguideline level by 2005, which countered any short-term effects of the guidelines. There was a significant long-term reduction in sentencing disparity based on race and marital status. Other significant changes in the distributions of extralegal characteristics over the long term included a high proportion of defendants ages 18-29 years and a higher proportion of defendants employed at the time of arrest. There were no changes in sentencing disparities based on a defendant's sex and means of support. There were virtually no changes in the magnitude of legally relevant effects. The postguideline stability for the reduction in disparities related to many extralegal factors in the court examined bodes well for the sentencing scheme in its intent to promote continuity in organizational performance. This may indicate strong judicial commitment to the implementation of the guidelines based on their flexibility, which allows judges to retain some discretion in the selection of sentences. Legal and extralegal effects of sentencing guidelines on case outcomes were examined for samples of defendants indicated on felony charges in one of Ohio's largest trial courts of general jurisdiction during three 1-year periods: 1995 (1 year prior to the sentencing reform); 1997 (1 year after the reform); and 2005 (9 years after and 1 year before the guidelines became voluntary). 4 tables and 49 references