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Despite advancements, screening instruments designed to identify children at risk for reading disabilities continue to have limited predictive validity. In this study, the authors examined a common screening instrument for the presence of floor effects and investigated the impact that these effects have on the predictive validity of the instrument. Longitudinal data (kindergarten to third grade) from a large cohort of children were used. These data included children's performance on five measures from the Dynamic Indicators of Basic Early Literacy Skills (DIBELS) and two reading achievement outcome measures. The results showed that DIBELS measures were characterized by floor effects in their initial administrations and that these effects reduced the predictive validity of the measures. The implications of these findings for early identification are discussed.<\/jats:p>","DOI":"10.1177\/0022219408326219","type":"journal-article","created":{"date-parts":[[2008,12,19]],"date-time":"2008-12-19T21:43:56Z","timestamp":1229723036000},"page":"163-176","source":"Crossref","is-referenced-by-count":166,"title":["Floor Effects Associated With Universal Screening and Their Impact on the Early Identification of Reading Disabilities"],"prefix":"10.1177","volume":"42","author":[{"given":"Hugh W.","family":"Catts","sequence":"first","affiliation":[{"name":"University of Kansas,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yaacov","family":"Petscher","sequence":"additional","affiliation":[{"name":"Florida State University, Florida Center for Reading Research"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher","family":"Schatschneider","sequence":"additional","affiliation":[{"name":"Florida State University, Florida Center for Reading Research"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mindy","family":"Sittner Bridges","sequence":"additional","affiliation":[{"name":"University of Kansas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katherin","family":"Mendoza","sequence":"additional","affiliation":[{"name":"Florida Center for Reading Research"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2008,12,10]]},"reference":[{"key":"atypb1","volume-title":"Beginning to read: Thinking and learning about print","author":"Adams, M.J.","year":"1990"},{"key":"atypb2","doi-asserted-by":"publisher","DOI":"10.1016\/1041-6080(91)90010-X"},{"key":"atypb3","volume-title":"The relationship between performance on a measure of oral reading fluency and performance on the Florida Comprehensive Assessment Test (Technical Report 1)","author":"Buck, J.","year":"2003"},{"key":"atypb4","doi-asserted-by":"publisher","DOI":"10.1598\/RRQ.37.4.4"},{"key":"atypb5","doi-asserted-by":"publisher","DOI":"10.3102\/00346543065001001"},{"key":"atypb6","doi-asserted-by":"publisher","DOI":"10.1177\/027112149201200205"},{"key":"atypb7","doi-asserted-by":"publisher","DOI":"10.1016\/S0010-0277(03)00164-1"},{"key":"atypb8","doi-asserted-by":"publisher","DOI":"10.1080\/02724980244000486"},{"key":"atypb9","doi-asserted-by":"publisher","DOI":"10.1207\/s1532799xssr0304_2"},{"key":"atypb10","doi-asserted-by":"publisher","DOI":"10.1044\/0161-1461(2001\/004)"},{"key":"atypb11","first-page":"9","volume":"2","author":"Cavanaugh, C.L.","year":"2004","journal-title":"Learning Disabilities: A Contemporary Journal"},{"key":"atypb12","doi-asserted-by":"publisher","DOI":"10.1037\/0022-0663.98.2.394"},{"key":"atypb13","unstructured":"Denton, C.A. & Mathes, P.G. 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