biostudies-literatureNorbury CFNational Institute for Health Research (NIHR)South London and Maudsley NHS Foundation TrustKing’s College LondonWellcome Trust1247-1257https://www.ebi.ac.uk/biostudies/studies/S-EPMC5082564biostudies-literatureUnknown57(11)<h4>Background</h4>Diagnosis of 'specific' language impairment traditionally required nonverbal IQ to be within normal limits, often resulting in restricted access to clinical services for children with lower NVIQ. Changes to DSM-5 criteria for language disorder removed this NVIQ requirement. This study sought to delineate the impact of varying NVIQ criteria on prevalence, clinical presentation and functional impact of language disorder in the first UK population study of language impairment at school entry.<h4>Methods</h4>A population-based survey design with sample weighting procedures was used to estimate population prevalence. We surveyed state-maintained reception classrooms (n = 161 or 61% of eligible schools) in Surrey, England. From a total population of 12,398 children (ages 4-5 yJournal of child psychology and psychiatry, and allied disciplinesThe impact of nonverbal ability on prevalence and clinical presentation of language disorder: evidence from a population study.PMC5082564WT094836AIANF-SI-0514-10073Norbury CFPickles AVamvakas GSimonoff EBaird GCharman TGooch DWray CfalseThe impact of nonverbal ability on prevalence and clinical presentation of language disorder: evidence from a population study.<h4>Background</h4>Diagnosis of 'specific' language impairment traditionally required nonverbal IQ to be within normal limits, often resulting in restricted access to clinical services for children with lower NVIQ. Changes to DSM-5 criteria for language disorder removed this NVIQ requirement. This study sought to delineate the impact of varying NVIQ criteria on prevalence, clinical presentation and functional impact of language disorder in the first UK population study of language impairment at school entry.<h4>Methods</h4>A population-based survey design with sample weighting procedures was used to estimate population prevalence. We surveyed state-maintained reception classrooms (n = 161 or 61% of eligible schools) in Surrey, England. From a total population of 12,398 children (ages 4-5 y2016-01-01T00:00:00Z2016 Nov2025-04-27T02:01:06.399Z2019-03-27T02:27:39ZS-EPMC50825642718470910.1111/jcpp.12573