Table 1.
Comparison between infants examined and not examined at 2 years of corrected age
| Examined at 2 years | Not examined at 2 years | |||
|---|---|---|---|---|
| n=3321 (%) | n=675 (%) | p Value | ||
| Gestational age (weeks) | ||||
| 22–26 | 4.7 | 4.0 | 0.06 | |
| 27–28 | 9.0 | 8.0 | ||
| 29–30 | 14.8 | 12.4 | ||
| 31–32 | 25.4 | 23.3 | ||
| 33–34 | 46.1 | 52.3 | ||
| Birth weight (g) | ||||
| 450–999 | 12.8 | 11.3 | 0.29 | |
| 1000–1499 | 25.5 | 23.4 | ||
| 1500–1999 | 36.0 | 36.9 | ||
| 2000 and more | 25.7 | 28.4 | ||
| Male | 54.6 | 51.4 | 0.13 | |
| Birth year | ||||
| 2003–2004 | 32.1 | 23.6 | 0.001 | |
| 2005–2006 | 33.3 | 36.2 | ||
| 2007–2008 | 34.6 | 42.5 | ||
| Cranial ultrasound/MRI abnormalities | ||||
| No cranial ultrasound, no MRI | 23.0 | 24.0 | 0.54 | |
| No lesions at cranial ultrasound and/or MRI | 69.6 | 70.7 | ||
| Intraventricular haemorrhage (grade II) | 3.6 | 2.7 | ||
| Intraventricular haemorrhage (grades III and IV) | 0.5 | 0.3 | ||
| White matter damage | 3.1 | 2.2 | ||
| White matter damage and intraventricular haemorrhage | 0.2 | 0.1 |