A mattress and a method of manufacturing a mattress are disclosed. The invention also relates to a method for determining the prognosis of an individual diagnosed with multiple myeloma as well as a method for the prediction of the response to treatment of an individual diagnosed with multiple myeloma. The drive assembly may include a drive wheel configured to engage the floor surface, and a pedal assembly operatively coupled to the drive wheel such that rotation of the pedal assembly rotates the drive wheel. An electrical component mounting rack includes a first frame attached to the U-shaped floor panel part, and a second frame attached to the top of the first frame and also to the floor pan wing panels. The invention also includes several embodiments for constructing such structures. By counting pixels of the respective colors, frame-by-frame during animation, the percentage of obscuration over time is quantified.