Cost-effectiveness planes. Four quadrants: NE stands for North-East (more effective and more costly), NW stands for North-West (less effective and more costly), SW stands for South-West (less effective and cheaper), and SE stands for South-East (more effective and cheaper). (a) Cost-effectiveness plane for Nigeria: 51% of the scatterplots were in the SE quadrant implying that more than half of the scatterplots indicated that the intervention is likely cost-effective. (b) Cost-effectiveness plane for India: 53% of the scatterplots were in the SE implying that more than half of the scatterplots indicated that the intervention is likely cost-effective. (c) Cost-effectiveness plane for South Africa: 56% of the scatterplots were in the SE implying that more than half of the scatterplots indicated that the intervention is likely cost-effective. CET, cost-effectiveness threshold; SSI, surgical site infection.