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The Corbett Targeted Coin Test: Reliability, criterion related validity, and normative data.
Kimatha O Grice1, Gustavo J Almeida2
1Department of Occupational Therapy, University of Texas Health Science Center, San Antonio, TX, USA.
Summary
The Corbett Targeted Coin Test (CTCT) shows moderate to excellent interrater reliability but poor test-retest reliability for assessing in-hand manipulation. Further research is needed to improve its reliability for clinical use.
Area of Science:
- Clinical measurement and assessment of fine motor skills.
- Occupational therapy and rehabilitation.
- Human motor control and dexterity.
Background:
- Daily living tasks frequently require in-hand manipulation (IHM).
- A need exists for standardized assessment tools to measure IHM.
- The Corbett Targeted Coin Test (CTCT) was developed to measure fine motor skills in IHM.
Purpose of the Study:
- To evaluate the interrater, test-retest reliability, and validity of the CTCT.
- To establish adult normative data for the CTCT.
Main Methods:
- Reliability and Validity: 30 participants (21-45 years) were assessed using the CTCT and Nine-Hole Peg Test by three researchers, with CTCT re-evaluation after one week.
- Reliability was assessed using intraclass correlation coefficients (ICC2,k).
- Normative Data: 190 participants (20-80 years) were assessed using the CTCT, with scores analyzed by age groups and gender.
Main Results:
- Test-retest reliability for the CTCT was poor for the right hand (ICCs = -0.29 to 0.45) and poor-moderate for the left hand (ICCs = 0.17-0.56).
- Interrater reliability ranged from moderate to excellent (ICCs = 0.60-0.80).
- Agreement between CTCT and Nine-Hole Peg Test scores was poor for both hands (ICCs = 0.02-0.06).
- Normative data indicated highest performance in the 41-50 age group and lowest in the 71-80 age group, with similar scores between genders.
Conclusions:
- The CTCT demonstrates acceptable interrater reliability, suggesting consistent administration by different testers.
- Poor test-retest reliability may be attributed to practice effects, indicating a need for refinement.
- The CTCT measures different constructs than the Nine-Hole Peg Test, suggesting it captures unique aspects of dexterity.
- The CTCT may offer an additional dimension for assessing fine motor skills and IHM but requires further research on test-retest reliability.
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