Absolute pitch ability has higher prevalence among those with Williams syndrome and those with an autism spectrum disorder, with rates as high as 30% claimed, stating that the rate among musicians in general is far lower. A non-verbal piano-matching method resulted in a correlation of 97% between autism and absolute pitch, with a 53% correlation in non-autistic observers. However, the converse is not indicated by research which found no difference between those with AP and those without on measures of social and communication skills, which are core deficits in autistic spectrum disorders. Additionally, the AP group's autism-spectrum quotient was "way below clinical thresholds".