04/06/2026
A study of 2.7 million people has found that autistic girls are being significantly underdiagnosed compared to autistic boys and the gap is far wider than previously understood.
Researchers found that girls were 50% less likely to receive an autism diagnosis than boys with the same traits. The study, published in JAMA Pediatrics, points to longstanding diagnostic criteria built almost entirely around male presentations.
Girls often “mask” more effectively — mirroring social behaviour to fit in — which means their difficulties go unnoticed until much later in life, if at all.
The researchers are calling for an urgent overhaul of diagnostic tools to account for how autism presents differently across genders.
Half the picture has been missing all along.