Data below are from a kidney transplant program. Serum creatinine measured in milligrams % was used as a diagnostic tool for detecting transplant rejection. If the serum creatinine is above a certain level one decides that rejection is imminent. Serum creatinine Sensitivity Specificity 1.2 0.939 0.123 1.3 0.939 0.203 1.4 0.909 0.281 1.5 0.818 0.380 1.6 0.758 0.461 1.7 0.727 0.535 1.8 0.636 0.649 1.9 0.636 0.711 2.0 0.545 0.766 2.1 0.485 0.773 2.2 0.485 0.773 2.3 0.394 0.811 2.5 0.364 0.870 2.6 0.333 0.891 2.7 0.333 0.894 2.8 0.333 0.896 2.9 0.303 0.909