That's a good point Dottie that I hadn't considered. I think the 2002 NWEA RIT Block Growth Norms are still in use. I can only find updated Normative Data (2008). The Block Growth norms only start for 2nd grade and that ties into this part:
RIT point growth norms are available for grades 2 � 10 in Reading, Language Usage, Mathematics, General Science Topics and Science Concepts and Processes.
For kindergarten and 1st grade, RIT block growth norms, based on 10-point RIT blocks, provide a reference for measuring typical growth in the primary grades.