One huge difference is the recognition that whereas research data are statistical, clinical data are usually not. In other words, when research data are obtained, there is a volume of data to which statistical methods are applied. The results indicate what the most common answer may be, but are always accompanied by ...
Statistical methods may be applied to a population, but not an individual. Research data are obtained from populations and can be statistically evaluated to reach conclusions. Individual clinical data cannot be subjected to statistical methods. Knowledge gained from research may be applied to the individual, but often requires modification guided by the individual response.