Table 1

Comparison between infants examined and not examined at 2 years of corrected age

Examined at 2 yearsNot examined at 2 years
n=3321 (%)n=675 (%)p Value
Gestational age (weeks)
 22–264.74.00.06
 27–289.08.0
 29–3014.812.4
 31–3225.423.3
 33–3446.152.3
Birth weight (g)
 450–99912.811.30.29
 1000–149925.523.4
 1500–199936.036.9
 2000 and more25.728.4
Male54.651.40.13
Birth year
 2003–200432.123.60.001
 2005–200633.336.2
 2007–200834.642.5
Cranial ultrasound/MRI abnormalities
 No cranial ultrasound, no MRI23.024.00.54
 No lesions at cranial ultrasound and/or MRI69.670.7
 Intraventricular haemorrhage (grade II)3.62.7
 Intraventricular haemorrhage (grades III and IV)0.50.3
 White matter damage3.12.2
 White matter damage and intraventricular haemorrhage0.20.1