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Maternal age adjusted rates of low birth weight (LBW), preterm birth (PTB), preterm birth and low birth weight (PT_LBW), and intrauterine growth retardation (IUGR in Korea from 1995 to 2008. *Test for trend: P < 0.001 for LBW, PTB, PT-LBW, P = 0.051 for IUGR.
