Fig. 3.

Neurodevelopmental impairments (NDI) in infants assessed at 3 years of age by gestational weeks (22–29 weeks) in period 1 (2003–2007, black bar) and period 2 (2008–2012, gray bar) in the Neonatal Research Network of Japan database. (A) Cerebral palsy, (B) blindness or amblyopia, (C) hearing impairment, (D) developmental delay including a developmental quotient <70 or delay judged by a pediatrician, (E) neurodevelopmental impairment. Numbers under the x-axis show the number of infants assessed for each impairment in periods 1 and 2. ^a)P<0.05, ^b)P<0.01 between the periods.