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Examining Differential Intervention Effects: Do Individualized Student Intervention Effects Vary by Student Abilities and Characteristics?

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Title: Examining Differential Intervention Effects: Do Individualized Student Intervention Effects Vary by Student Abilities and Characteristics?
Authors: van Dijk, Wilhelmina (AUTHOR), Schatschneider, Christopher (AUTHOR), Al Otaiba, Stephanie (AUTHOR), Lane, Holly B. (AUTHOR), Hart, Sara A. (AUTHOR)
Source: Exceptional Children. Apr2026, Vol. 92 Issue 3, p238-263. 26p.
Subjects: Individualized instruction, Reading intervention, Randomized controlled trials, Academic ability, Reading, Quantile regression
Abstract: The Individualized Student Instruction (ISI) intervention was designed to help teachers increase their use of differentiated core reading instruction, to optimize student growth by providing appropriate amounts of code- and meaning-focused instruction. Based on the results from original studies on ISI, it is still unclear if differentiated instruction can mitigate the influence of individual differences, and if this is similar for all students. Using integrative data analytic techniques, we combined data from six randomized control trials on the ISI intervention conducted in kindergarten and first grade and obtained a dataset with a total sample of 3,144 students in Grades K and 1. We then fit conditional multilevel quantile regression models to examine differential effects on word reading and vocabulary outcomes and the moderating effect of pre-intervention skills. The model coefficients did not indicate a treatment effect of the ISI intervention on either vocabulary or word reading skills. We discuss these results in the light of the importance of data sharing and registered reports to uncover what works for which students under which conditions. [ABSTRACT FROM AUTHOR]
Copyright of Exceptional Children is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Examining Differential Intervention Effects: Do Individualized Student Intervention Effects Vary by Student Abilities and Characteristics?
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  Data: <searchLink fieldCode="JN" term="%22Exceptional+Children%22">Exceptional Children</searchLink>. Apr2026, Vol. 92 Issue 3, p238-263. 26p.
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  Data: <searchLink fieldCode="DE" term="%22Individualized+instruction%22">Individualized instruction</searchLink><br /><searchLink fieldCode="DE" term="%22Reading+intervention%22">Reading intervention</searchLink><br /><searchLink fieldCode="DE" term="%22Randomized+controlled+trials%22">Randomized controlled trials</searchLink><br /><searchLink fieldCode="DE" term="%22Academic+ability%22">Academic ability</searchLink><br /><searchLink fieldCode="DE" term="%22Reading%22">Reading</searchLink><br /><searchLink fieldCode="DE" term="%22Quantile+regression%22">Quantile regression</searchLink>
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  Label: Abstract
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  Data: The Individualized Student Instruction (ISI) intervention was designed to help teachers increase their use of differentiated core reading instruction, to optimize student growth by providing appropriate amounts of code- and meaning-focused instruction. Based on the results from original studies on ISI, it is still unclear if differentiated instruction can mitigate the influence of individual differences, and if this is similar for all students. Using integrative data analytic techniques, we combined data from six randomized control trials on the ISI intervention conducted in kindergarten and first grade and obtained a dataset with a total sample of 3,144 students in Grades K and 1. We then fit conditional multilevel quantile regression models to examine differential effects on word reading and vocabulary outcomes and the moderating effect of pre-intervention skills. The model coefficients did not indicate a treatment effect of the ISI intervention on either vocabulary or word reading skills. We discuss these results in the light of the importance of data sharing and registered reports to uncover what works for which students under which conditions. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Exceptional Children is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1177/00144029251378405
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      – Code: eng
        Text: English
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        PageCount: 26
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      – SubjectFull: Individualized instruction
        Type: general
      – SubjectFull: Reading intervention
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      – SubjectFull: Randomized controlled trials
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      – SubjectFull: Academic ability
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      – SubjectFull: Reading
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      – SubjectFull: Quantile regression
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              Text: Apr2026
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              Y: 2026
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