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The different grades of the Risser sign give a measure of bone maturity and thus of the skeletal growth to be expected. In Europe, a scale ranging from Risser 0 to Risser 5 defines the grades from beginning ossification to complete fusion of the apophysis to the iliac bone. In the USA, 4 grades are defined.
When a student completes an NWEA MAP assessment, he or she receives a series of RIT. scores as a result. So, what is a RIT and what do the scores mean? RIT is an abbreviation for Rausch Unit.. The difficulty and complexity of each MAP. assessment question is measured using the RIT scale.