Written Language Intervention for Adults With Intellectual and Developmental Disabilities

NCT ID: NCT05851937

Last Updated: 2026-01-14

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 55 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2023-05-01
• Study Completion Date: 2025-02-15

Brief Summary

The purpose of this study is to evaluate the effects of a written language intervention using functional texts for young adults with intellectual and developmental disabilities.

Detailed Description

Individuals with intellectual and developmental disabilities (IDD) often present with limited literacy achievement which results in an absence of opportunities to foster written language development. However, when young adults with IDD are provided opportunities to broaden their literacy education even after high school, they continue to develop and improve their written and spoken language skills, which is associated with improved vocational and independent living options. To date, few studies have examined effective communication interventions for the often-underrepresented population of young adults with IDD. The objective of this study is to examine the feasibility, acceptability, and initial effectiveness of a functional written language intervention embedded in naturally occurring daily activities (e.g., text messages, emails) for young adults with IDD. The central hypothesis is that (a) explicit written language intervention for functional texts (WLIFT) will result in greater use of reading comprehension strategies before, during, and after reading and (b) use of reading comprehension strategies will be associated with improvements in written and spoken language outcomes. The specific aims include (1) examining the effects of WLIFT intervention on use of reading comprehension strategies in functional texts by young adults with IDD, 2) examining the effects of the intervention on distal written language outcomes, and (3) examining the effects of the intervention on distal spoken language outcomes. The study target enrollment includes 40 young adults with IDD who will be randomly assigned to either the treatment or control group. Individuals in both groups will be assessed: (a) at the start of the study, (b) at the conclusion of intervention, and (c) six months following the conclusion of intervention. Individuals with IDD in the WLIFT group will receive 3-months of intervention that: (a) utilizes functional texts-activities of daily living that involve written language (e.g., text messages), (b) is specifically designed based on the phenotype of commonly occurring IDDs and is delivered at a critical time as young adults transition to independence, (c) involves teaching and assessing comprehension strategies implemented before, during, and after reading that have been previously shown to be associated with stronger written and spoken language skills in struggling readers, and (d) is implemented via telepractice to promote service delivery in meaningful contexts for the individual with IDD. This research is significant because it is expected to apply, adapt, and evaluate written language strategies found to be effective in other populations of struggling readers, thereby advancing the field of language development in individuals with IDD, where there is a striking paucity of communication intervention research.

Conditions

Intellectual Disability; Developmental Disability

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: SINGLE

Study Groups

Written language intervention

Participants will receive 3 months of weekly written language intervention sessions via telepractice.

Participants will be assessed at three time points to monitor outcomes.

Group Type: EXPERIMENTAL

Written language intervention

Intervention Type: BEHAVIORAL

Young adults with Intellectual and Developmental Disabilities (IDD) are taught reading comprehension strategies in three phases (before, during, after) using a graphic organizer as visual support. At the beginning of each phase, the interventionist: (a) defines the strategies, (b) describes and models how to use the strategies, and (c) answers questions about the strategies. Then the participant practices the strategies during 45-min sessions, two times per week, over 3 months. Each session follows the teach-model-coach-review format, the interventionist: (a) reviews the strategies (5 min), (b) models the strategies using a think-aloud (10 min), (c) prompts the participant to practice the strategies with support (15 min), (d) prompts the participant to use a think-aloud to practice the strategies independently using a functional literacy text (10 min), and (e) reviews and summarizes the session (review; 5 min).

Periodic language check-up

Participants will be assessed at three time points to monitor outcomes.

Group Type: NO_INTERVENTION

No interventions assigned to this group

Interventions

Written language intervention

Young adults with Intellectual and Developmental Disabilities (IDD) are taught reading comprehension strategies in three phases (before, during, after) using a graphic organizer as visual support. At the beginning of each phase, the interventionist: (a) defines the strategies, (b) describes and models how to use the strategies, and (c) answers questions about the strategies. Then the participant practices the strategies during 45-min sessions, two times per week, over 3 months. Each session follows the teach-model-coach-review format, the interventionist: (a) reviews the strategies (5 min), (b) models the strategies using a think-aloud (10 min), (c) prompts the participant to practice the strategies with support (15 min), (d) prompts the participant to use a think-aloud to practice the strategies independently using a functional literacy text (10 min), and (e) reviews and summarizes the session (review; 5 min).

Intervention Type: BEHAVIORAL

Eligibility Criteria

Inclusion Criteria

• intellectual and/or developmental disability
• correctly read at least 80% of words on word reading screener
• have functional literacy needs
• English as primary spoken language and use oral communication as their primary form of communication
• normal or corrected to normal vision

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 26 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

National Institutes of Health (NIH)

NIH

Sponsor Role: collaborator

National Institute on Deafness and Other Communication Disorders (NIDCD)

NIH

Sponsor Role: collaborator

Baylor University

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Locations

Baylor University

Waco, Texas, United States

Countries

United States

Provided Documents

Document Type: Study Protocol and Statistical Analysis Plan

View Document

Document Type: Informed Consent Form

View Document

Other Identifiers

R21DC020787

Identifier Type: NIH

Identifier Source: secondary_id

View Link

BaylorU

Identifier Type: -

Identifier Source: org_study_id