The research team developed a 'cost-to-baby' metric to evaluate the financial barrier to entry, comparing treatment expenses against median after-tax household income. The findings demonstrate staggering inequality: while Israel requires only 13% of a household's annual income for net out-of-pocket costs, the figure balloons to 825% in parts of Africa. This financial disparity creates a stark divide in reproductive outcomes, as nations with higher costs see birth rates via ART plummet to as low as 0.2%.

Countries that maintain net out-of-pocket costs below 50% of median household income, such as South Korea, Spain, and Japan, consistently report the highest usage levels. According to lead author Dr. Stephanie Kuku of Conceivable Life Sciences, the data suggests that these affordability thresholds serve as the primary driver for accessibility. The study effectively accounts for 77% to 84% of the global variation in ART utilization, highlighting that policy-driven subsidies are the most effective lever for improving reproductive health outcomes worldwide.