Table 3.

Neurodevelopmental results at 5.5 years of all 484 infants, born <27 weeks’ GA who reached 5.5 years’ CA in 2018–2020, separately for infants born at 24, 25 and 26 weeks’ gestation

	Total	24 weeks	25 weeks	26 weeks	P value
Impairment categorisation at 5.5 years’ CA, N evaluated	484	95	145	244
None	46% (41–50)	40% (28–48)	42% (34–51)	51% (44–57)	0.044*
Mild	36% (32–41)	39% (29–50)	35% (27–44)	36% (30–42)
Moderate-to-severe	18% (15–22)	23% (15–33)	23% (16–31)	13% (9–18)
Impairment categorisation at 2 years’ CA, N evaluated	472	88	143	241
None	61% (57–66)	53% (43–64)	60% (52–68)	65% (59–71)	0.116*
Mild	31% (27–35)	35% (25–46)	29% (22–38)	30% (24–36)
Moderate-to-severe	8% (6–11)	11% (6–20)	11% (6–17)	5% (3–9)

Of 484 children seen at 5.5 years’ CA, data of 472 children were also available at 2 years’ CA. Results are presented as % (95% CI).

*P value is the result of a χ² test applied on all three categorical rows of the score. A p value <0.05 is considered significant.

CA, corrected age; GA, gestational age.