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Objective Assess regional differences in categorization of preterm delivery outcomes and impact on variation in reported infant mortality rates.Study design A 27-item questionnaire was distributed to 1072 practitioners associated with U.S. birth hospitals. Five clinical scenarios were created to identify how participants classify delivery outcomes. Statistical analysis included Chi-square analysis and multinomial logistic regression.Results 234 questionnaires were completed (response rate 22%). While 90% respondents classified a