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835 [95% confidence interval (CI) 0.784-0.886]. In the validation cohort, the AUC of the model was 0.829 (95% CI 0.699-0.959). We developed and validated an effective 17-point risk-scoring model that could preoperatively predict LNM for EGC patients. We developed and validated an effective 17-point risk-scoring model that could preoperatively predict LNM for EGC patients.In the practical application of air protection, diverse dispersion models are used to calculate the concentration of contaminants in the air. They usually involve a universal character, whi