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The Kaplan–Meier curve presenting the risk of asthma and AD according to the degree of prematurity. a Risk of asthma. b Risk of AD. The x-axis represents the age of the population, and the y-axis represents the disease-free probability. The number of children at risk of each study group is included. Abbreviations: EP, extremely preterm infants; OP, other preterm infants; FT, full-term infants; AD, atopic dermatitis
