Fig. 1From: Cost-effectiveness of an ambulance-based referral system for emergency obstetrical and neonatal care in rural EthiopiaSensitivity analyses according to the proportion of undoutedly effective referrals (upper panel) and the cost of the ambulance (lower panel). In the two panels, the two dotted lines represent the benchmarks to define attractive interventions (150 US dollars, upper line) and very attractive interventions (30 US dollars, lower line). The costs of the ambulance refer to a three months period of useBack to article page