Table 3.
NDI of VLBW infants followed up at 3 years of age included in the NRNJ
| Type of impairment | Total | <1,000 g | 1,000–1,500 g |
|---|---|---|---|
| Death by 3 years of age | 3,614/40,728 (8.9) | 2,727/17,890 (15.2) | 887/22,838 (3.9) |
| Survivors with follow-up data | 18,110/37,114 (48.8) | 8,132/15,163 (53.6) | 9,978/21,951 (45.5) |
| Cerebral palsy (GMFCS 2) | 1,204/17,078 (7.1) | 725/7,631 (9.5) | 479/9,447 (5.1) |
| Uni- or bilateral blindness | 301/16,418 (1.8) | 234/7,346 (3.2) | 67/9,072 (0.7) |
| Any blindness or amblyopia | 497/16,418 (3.0) | 400/7,346 (5.4) | 97/9,072 (1.1) |
| Hearing amplification | 118/13,114 (0.9) | 90/5,886 (1.5) | 28/7,228 (0.4) |
| DQ of KSPD <70 | 2,085/13,100 (15.9) | 1,369/5,938 (23.1) | 716/7,162 (10.0) |
| Judged as delayed by pediatricians | 409/1,898 (21.5) | 268/881 (30.4) | 141/1,017 (13.9) |
| NDI full evaluation | 2,066/11,015 (18.8) | 1,329/4,927 (27.0) | 737/6,088 (12.1) |
| NDI not full evaluation | 1,392/7,095 (19.6) | 908/3,205 (28.3) | 484/3,890 (12.4) |
| NDI in survivors with follow-up data | 3,458/18,110 (19.1) | 2,237/8,132 (27.5) | 1,221/9,978 (12.2) |
| Death or NDI in all study subjects | 7,072/40,728 (17.4) | 4,964/17,890 (27.7) | 2,108/22,838 (9.2) |
Values are presented as no. of infants with impairment/no. of infants with assessments.
NDI, neurodevelopmental impairment; VLBW, very low birth weight; NRNJ, Neonatal Research Network of Japan; GMFCS, Gross Motor Function Classification System; DQ, developmental quotient; KSPD, the Kyoto Scale of Psychological Development.