The range rule tells us that the standard deviation of a sample is approximately equal to one fourth of the range of the data. In other words s = (Maximum â Minimum)/4. This is a very straightforward formula to use, and should only be used as a very rough estimate of the standard deviation.
Often abbreviated as âDMEâ, durable medical equipment includes various types of walking aids, transfer equipment, bath safety and wheelchairs. As the name implies, this category must be manufactured and tested to be âdurableâ because patients who use this equipment rely on it to keep them safe and comfort.
If benefit coverage for durable medical equipment is available, the following criteria apply. Equipment Coverage Guidelines. Patient lifts (E0630, E0639) Mechanical/hydraulic patient lifts (non-electric) may be. considered medically necessary durable medical equipment. (DME) when ALL of the following criteria are met: