Raising awareness of Developmental Language Disorder is everyone’s job. We’ve created this simple printable handout to help you rally your community and build DLD Awareness.
Access the flyer via the link below as a print ready PDF file with two per page.
Love this website! What an incredible resource. Quick question– where did the 1 in 14 and 2 per classroom data come from? Do you have a few citations for that? Thanks!
Hi Meredith,
Thanks for your feedback and apologies for the delay in replying! We only spotted some earlier comments on our website recently. There have been a few prevalence studies suggesting the prevalence of Developmental Language Disorder (DLD) varies from 5-10%. We use 7% (or 1 in 14 people) based on Tomblin et al. (1997) and Norbury et al. (2016). While most of the research has been conducted in childhood, Conti-Ramsden’s longitudinal study (along with many others), suggests that DLD is stable across the lifespan, so we anticipate the prevalence is stable. However, it would be wonderful to have prevalence studies that include wider age ranges!
Please see some key references below. Thanks, Shaun
Norbury, C.F., Gooch, D., Wray, C., Baird, G., Charman, T., Simonoff, E., Vamvakas, G., & Pickles, A. (2016), The impact of nonverbal ability on prevalence and clinical presentation of language disorder: evidence from a population study. Journal of Child Psychology and Psychiatry, 57, 1247-1257. https://doi.org/10.1111/jcpp.12573
Tomblin, J. B., Records, N. L., Buckwalter, P., Zhang, X., Smith, E., & O’Brien, M. (1997). Prevalence of specific language impairment in kindergarten children. Journal of speech, language, and hearing research : JSLHR, 40(6), 1245–1260. https://doi.org/10.1044/jslhr.4006.1245