A record of Body Mass Index (BMI) of the Patient enrolled in the Spinal Cord Injury and Disorders program. The BMI is derived from the height and weight of the patient. As the patient's height changes slowly over time, this record is primarily showing changes in the patient's weight. When using Detailed Clinical Models (DCMs) for the Height, Weight, and BMI, a number of the properties that this class inherits from its supertype are duplicative and can be derived from the DCMs.