TABLE 2

Cost-effective Analysis

StrategyCost, $Incremental Cost, $Effectiveness, QALYsIncremental EffectivenessICER, $ per QALY
Strategy E: staged ultrasound, CT if US does not visualize appendix but has secondary signs of inflammation4815.0300.9969400
Strategy H: staged ultrasound, MRI if ultrasound does not visualize appendix but has secondary signs of inflammation5070.69255.660.9969864.37 × 10−55 846 752
Strategy B: MRI5521.28450.590.9970152.90 × 10−51.56×107