Describe the features of a diagnostic test BT_PO 1.2

Why you need to know this is well described in Yentis SM. Predicting difficult intubation – worthwhile exercise or pointless ritual? Anaesthesia 2002 ; 57: 105-109.

In the context of difficult intubation :

TRUE/FALSE  The sensitivity is the proportion of difficult patients who are correctly identified.

TRUE/FALSE  The specificity is the proportion of easy patients who are correctly identified.

TRUE/FALSE  As the prevalence of difficult intubation increases the sensitivity will increase.

TRUE/FALSE  As the prevalence decreases the positive predictive value increases.

TRUE/FALSE  If the test has high specificity it will have a high negative predictive value.