Welcome to the ANCDS Aphasia Treatment Website

Overview                                               

This website includes composite tables of aphasia treatment studies reported in the literature. The studies are grouped according to the nature of the primary outcome variable, that is, the primary dependent variable of interest.

The tables include information regarding the study design, number of participants (n), class (C), and phase of treatment research (Ph), and the type of treatment. 

New! Effect size calculations are included in the table.
Effect sizes are calculated based on the data provided in the published papers. For that reason, not all papers have associated effect sizes.

New! You can send information to enter studies that are missing from this website! Follow the link below.
           Link to Enter Studies

Coming Soon: We are building an on-line effect size calculator to assist researchers in calculating the d statistic for single subject design studies.

Data Provided for Each Study

  • Treatment Category (based in primary dependent variable)
  • Study design
  • Levels of evidence 
  • Treatment description

Study Designs are coded as follows:

  • RCT       = Randomized control trial
  • G b/t       = Between group design
  • G w/in    = Within group design
  • CSeries = Cases Series
  • SS          = Single subject design
  • CS          = Case study (non experimental)

Class of Study was coded in accordance with American Academy of Neurology guidelines (2001).

Class Stength Evidence provided by:
1 Strongest One or more well designed randomized control trials, including meta-analyses of such trials
2 Intermediate Well designed observational studies with concurrent controls. Single subject multiple baseline studies across subjects.
3 Weakest Expert opinion, case studies, case reports, studies with historical controls. Single subject multiple baseline studies across behaviors.

Levels of evidence (see ASHA EPB websitehttp://www.asha.org/members/ebp/assessing.htm

Level Evidence provided by:
Ia Well-designed meta-analysis of greater than 1 randomized control trial
Ib Well-designed randomized controlled study.
IIa Well-designed controlled study without randomization.
IIb Well controlled quasi-experimental study.
III Well-designed non-experimental studies, i.e., correlational studies and case studies.
IV Expert committee report, consensus conference, clinical eperience of respected authorities.

Adapted by ASHA from Intercollegiate Guidelines Network. 
Phase of treatment research is coded according to Robey and Schultz (1998)

Phase Type Goals
1 Pre-efficacy to determine if there is evidence to suggest that a tx has therapeutic value
2 Pre-efficacy to develop, standardize, validate, and optimize procedures to explain why treatment works; who are ideal candidates
3 Efficacy tests tx efficacy under ideal conditions
4 Effectiveness to determine effectiveness of treatment under ordinary conditions of use
5 Effectiveness explore efficiency, cost-benefit, patient and family satisfaction, the influence of treatment on patients' quality of life

 See also: Robey R (2004). A five-phase model for clinical-outcome researchJournal of Communication Disorders, 37, 401-411).

Additional resources regarding evidence-based practice in aphasia.