Jebsen-Taylor Hand Function Test

Abstract

The Jebsen-Taylor Hand Function Test (JTHFT) is a standardized, timed assessment designed to objectively measure the effectiveness and dexterity of the hand and upper extremity function. It requires the patient to complete seven specific, simulated tasks that reflect various aspects of daily living. The test is categorized as a performance measure, where the primary metric recorded is the time taken, in seconds, to complete each subtest. This standardized procedure allows clinicians to quantify functional deficits and track progress in rehabilitation settings.

Keywords

Jebsen-Taylor Hand Function Test, Hand function, Dexterity, Performance measure, Rehabilitation, Occupational therapy, Upper extremity, Activities of Daily Living (ADL), Motor skills, Timed assessment

Authors

Jebsen RH, Taylor N, Trieschmann RB, Trotter MJ, Howard LA

Purpose

The primary purpose of the JTHFT is to provide a quantitative measure of the patient’s capacity to execute standardized, simulated activities representative of typical daily tasks. It is widely used in clinical and research settings to assess the impact of disease or injury on fine and gross motor skills of the hand.

The test is particularly valuable for identifying functional impairments in individuals with neurological or orthopedic conditions affecting the upper limbs. By measuring time rather than subjective ratings, the JTHFT offers an objective benchmark for evaluating the effectiveness of surgical or therapeutic interventions.

Construct

The JTHFT measures the construct of functional hand dexterity and speed. This construct encompasses the coordinated use of the hand and arm necessary for manipulating objects and performing tasks related to self-care and work. It is fundamentally a measure of motor performance rather than cognitive ability or self-reported function.

The seven subtests are designed to isolate key components of hand function, including pinch strength, grasp, speed of movement, and coordination. Successful completion of the test requires adequate range of motion, motor planning, and sustained attention, positioning the JTHFT as a comprehensive assessment of practical hand competency.

Validity

The JTHFT demonstrates strong content validity, as its tasks directly mimic essential ADL components. Numerous studies have established its concurrent validity, showing high correlation with other established measures of hand function, such as the Purdue Pegboard and grip strength dynamometers.

Construct validity is supported by its ability to differentiate between healthy individuals and patient populations (e.g., those with stroke, rheumatoid arthritis, or spinal cord injury). Furthermore, its sensitivity to change ensures that the test possesses predictive validity for tracking functional recovery over time, particularly in rehabilitation protocols.

Reliability

The JTHFT exhibits high levels of inter-rater and test-retest reliability when administered according to standardized procedures. The objective nature of the timing metric minimizes subjective interpretation, contributing significantly to its reliability profile.

Specific subtests, such as the writing task, may show slightly lower reliability due to variations in handwriting speed and fatigue, but overall test reliability remains robust across various clinical populations. Standardized training for administrators is critical to maintaining the high reliability indices associated with the JTHFT.

Factor Analysis

Factor analysis studies generally confirm that the JTHFT primarily measures a single dominant factor: overall gross manual dexterity and functional speed. However, analyses often reveal a secondary factor related specifically to fine motor coordination, particularly loading on tasks like writing and stacking checkers.

The high intercorrelation among the seven subtests suggests that they all contribute substantially to the core construct of hand function. Researchers typically interpret the results as a holistic measure of functional ability, with the timing of individual subtests offering diagnostic insights into specific motor deficits.

Instrument

Test Type: Instrumental, Performance

Format: Timed execution of seven standardized tasks using specific testing materials (e.g., cards, checkers, cans, writing implements).

Language Available: Primarily used in English-speaking countries, but the performance-based nature makes it largely language-independent, though instructions must be translated.

Population Group: Children, Elderly, Volwassenen (Adults)

Age Group: Typically used for individuals aged 6 years and older, provided they can follow instructions and perform the tasks.

Population Details: Used across a broad spectrum of clinical populations, including those with conditions affecting the Musculoskeletal system and the Nervous system (e.g., stroke, multiple sclerosis, cerebral palsy).

Test Methodology: The patient performs the seven tasks sequentially, typically starting with the non-dominant hand. The time taken for each task is recorded in seconds. The final score is the sum of the time recorded for all seven subtests, with lower scores indicating better hand function.

Keywords

Functional assessment, Hand dexterity, Fine motor skills, Gross motor skills, Musculoskeletal system assessment, Neurological rehabilitation, Occupational therapy assessment, Timed performance

Authors

Author ORCID Identifier: Information not consistently available for all original authors.

Affiliation Email addresses: Information not consistently available.

Correspondence Address: Correspondence is typically directed toward major rehabilitation research centers that utilize and study the JTHFT.

Permissions & Fee and Test Year

The original publication describing the test methodology was published in 1972. The JTHFT is generally considered to be in the public domain for clinical use, although specific commercial testing kits may require purchase.

The test materials are simple and can often be assembled by a clinic using standard items. No specific licensing fee is usually required for administration in clinical practice.

The original PDF explanatory form (Toelichtingsformulier) for this instrument can be downloaded here: Jebsen-form.pdf

Reference’s

• Jebsen, R. H., Taylor, N., Trieschmann, R. B., Trotter, M. J., & Howard, L. A. (1972). An objective measurement of functional hand strength. Archives of Physical Medicine and Rehabilitation, 53(7), 311-319.
• Additional normative and reliability studies published widely in physical and occupational therapy literature subsequent to the original 1972 publication.

Items of the Jebsen-Taylor Hand Function Test

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

De patiënt moet een zevental handelingen uitvoeren, zoals:

• kleine objecten oppakken en in een blik plaatsen
• omdraaien van speelkaarten
• schrijven van een korte zin
• simuleren van eten
• stapelen van damstenen
• grote lege objecten verplaatsen
• grote zware objecten oppakken