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Updated: Jan 25, 2026

Using Cholesky Decomposition to Explore Individual Differences in Longitudinal Relations between Reading Skills
Published on: September 17, 2019
Longitudinal outcomes of an individualized and intensive reading intervention for third grade students
Marita Partanen1, Linda S Siegel1, Deborah E Giaschi2
1Department of Educational & Counselling Psychology, and Special Education, Faculty of Education, The University of British Columbia, Vancouver, BC, Canada.
Abstract:
Early intervention is known to reduce reading disabilities; however, treatment response is variable, and some students have persistent deficits that require intensive supports. This study examined the immediate and 1-year outcomes of an individualized and intensive reading program for third grade students, which was delivered throughout the school day for an average of 189 hr of instruction over 3 months. These students' performances were compared with two comparison groups, including poor readers who received small group supports and good readers who did not have additional reading instruction. The intensive group showed an improvement in word recognition and decoding fluency immediately after the program and 1 year later, and there was a decrease in significant reading impairments from 62% before intervention to 35% at follow-up. Furthermore, baseline reading, spelling, phonological awareness, and rapid naming skills were predictive of persistent reading deficits at a later time point. Although improvements in reading skills were shown, a significant gap between poor and good readers persisted in the third and fourth grades. This study illustrates the importance of a tertiary intensive reading program, but also the need for continuing supports.
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