Probabilistic sensitivity analysis found that the additional $ 947 in lifetime cost of the intervention had a 95 % confidence interval of - $ 331 to 2081 ; the 0.15 additional QALYs had a confidence interval of 0.035-0 .280 , and that the intervention was cost-effective against a $ 50000/QALY acceptance criterion in 99.6 % of the replicates .