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.
4) Durable medical equipment: Wheel chair, commodes and raised toilet sheet, walker and power operated vehicles which improves the quality of living of the patients are known as durable medical equipment. It also includes iron lungs, oxygen tents, nebulizers, catheters and hospital beds.
COVERAGE RATIONALE. Indications for Coverage. ï· Durable Medical Equipment (DME) is a Covered Health Service when the member has a Durable Medical. Equipment benefit, the equipment is ordered by a physician to treat an injury or sickness (illness) and the. equipment is not otherwise excluded in the benefit document.