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When Is the Ordinal Level of Measurement the Correct Level

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When is the ordinal level of measurement the correct level of measurement to use?


Definitions:

SA Node

Sinoatrial Node; the heart’s natural pacemaker, responsible for initiating the electrical impulses that determine the heart rate.

Pulse Oximetry

A non-invasive method to measure the oxygen saturation level of the blood using a device attached usually to a fingertip.

Sleep Apnea

A condition characterized by pauses in breathing during sleep.

Ultrasound

A technique that uses high-frequency sound waves to create images of the inside of the body.

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