Investigating the Diagnostic Consistency and Incremental Validity Evidence of Curriculum-based Measurements of Oral Reading Rate and Comprehension

  • Calvary R. Diggs
  • Theodore J. Christ


Rate and comprehension are two components related to broad reading abilities (i.e., phonemic awareness, decoding, vocabulary, comprehension). The purpose of this study was to examine the unique contribution of three curriculum-based measures (CBM)-comprehension assessments compared to a CBM-oral reading rate assessment through diagnostic consistency and incremental validity analyses. An extant sample of fall screening data in a national assessment system were used for this investigation. The CBM-comprehension assessments measured oral recall, synthesis of main ideas, and free-response question-answering. Scores from the CBM-comprehension measures were associated with weak criterion-related validity to a measure of broad reading. In addition, diagnostic consistency analyses revealed poor overlap between CBM-comprehension and CBM-oral reading rate assessment score classifications based on at-risk benchmarks. Incremental validity evidence replicated previous findings, demonstrating that the CBM-comprehension measures explain unique variation in broad reading scores even after controlling for rate and accuracy. Implications for the usage of CBM-R and CBM-comprehension for screening is addressed.


Reading Comprehension CBM Screening Assessment Assessment to intervention 



Preparation of this manuscript was supported in part by grants from the Office of Special Education Programs, US Department of Education (H327S150004; R305A120086) and the National Institute of Mental Health, US Department of Health and Human Services (5T32MH010026).

Compliance with Ethical Standards

Ethical Approval

All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed Consent

Informed consent was obtained from all individual participants included in the study.

Conflict of Interest

Calvary Diggs has no conflict of interest. Dr. Theodore Christ has received royalties from Fastbridge Learning.


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Copyright information

© California Association of School Psychologists 2018

Authors and Affiliations

  1. 1.University of MinnesotaMinneapolisUSA

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