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Table 3: Comparison of risk factors between 2 groups based on the severity of respiratory morbidity (Group 1 [Category 1 or 4] and Group 2 [Category 2 or 3])

Table 3: Comparison of risk factors between 2 groups based on the severity of respiratory morbidity (Group 1 [Category 1 or 4] and Group 2 [Category 2 or 3])