In conducting measures one selects instruments that provide valid results. To the extent the questionnaire in fact is a useful discriminant, then the instrument may benefit both hospital and patients.
The questionnaire will include a number of questions intended to provide a summary picture of each patient so that if resources are limited, the most at risk patients may get priority. For example, doctors use a questionnaire to rank cardiac patients for attention in perioperative care, the care a surgical patient receives from admittance to release from the hospital, to improve patient outcomes. In other arenas, the choice of instrument will be less clear. In many cases choices are straightforward: in morphometrics, the instruments of choice will be lengths and areas and shapes quantified by rulers and application of well-defined geometry equations. In biology and biomedical research, there are thousands of kinds of measurements one has to choose among depending on the question at hand. Instrument in this context however also includes questionnaires or surveys intended. An instrument may indeed be an instrument like a sphygmomanometer or a thermocycler equipped with fluorescent optics. The method used to obtain the measurement is called the instrument. Instead of a number, a measure may return a classification: for a given sample unit, the unit may be categorized as meeting the definition and therefore given a “yes” or it does not (“no”). As review, a measure is simply the result of some process used to quantify an object or item of interest. What’s in a measure? We’ve talked about measurement extensively in Chapter. 16.5 – Instrument reliability and validityĬhapter 16, continued.
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