The incremental cost per quality adjusted life year for the endorectal coil was $1,158 relative to the pelvic multi coil array, and for the high-specificity coil was $10,525, compared to the endorectal coil. The two main model results (endorectal magnetic resonance imaging is more cost-effective than conventional magnetic resonance imaging and the use of strict criteria for extraprostatic disease is more cost-effective than the use endorectal magnetic resonance imaging) were unchanged throughout the "reasonable" ranges for each parameter. Endorectal magnetic resonance imaging was more cost-effective than conventional magnetic resonance imaging if it provided a 1.5% increase in sensitivity or a 0.2% increase in specificity. According to the authors, the use of strict criteria for extraprostatic disease was cost-effective as long as the incremental cost of prostatectomy remained less than $18,700 and the therapeutic benefits of prostatectomy were at least 1.2 years.