[Hank Rearden]

Yes, nearly half do show signs; more than half don't.

How do you derive that statement? Here's what the article said:
They found that 46 percent had severe or moderate disabilities such as cerebral palsy, vision or hearing loss and learning problems; 34 percent were mildly disabled; and 20 percent had no disabilities.

I read that as 80% with problems (46% severe), 20% without.

[SittinYonder]

Nearly half of all infants born extremely premature have significant learning and physical disabilities by the time they reach school age, the largest such study has found.

More than half of all infants born extremely premature do not have significant learning and physical disabilities ...

[BigSkyFreeper]

I don't consider Cerebal Palsy a "problem". I guess that's what one would consider adapting.

[Vn_survivor_67-68]

Normal pregnancy is 37 to 42 weeks.

(study cohort was) born between 22 and 25 weeks.

also worth noting, IMO