Yes, nearly half do show signs; more than half don't.
Okay. I agree with you. Thank you for your correction.
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.