Nine-Hole Peg Test

Abstract

The Nine Hole Peg Test (NHPT) is a standardized, time-based performance assessment designed to measure the speed and coordination of fine manual dexterity. Developed in 1971, the test requires the subject to rapidly pick up and place nine small pegs into corresponding holes on a board, and then remove them and return them to a container. The total time taken to complete both the placement and removal phases is recorded, typically separately for each hand. The NHPT is widely utilized in clinical and research settings to evaluate functional capacity, particularly related to the upper extremity.

Keywords

Nine Hole Peg Test, NHPT, fine manual dexterity, motor speed, upper extremity function, neurological assessment, rehabilitation, timed performance test, musculoskeletal system.

Authors

Kellor M, Frost J, Silberberg N, Iversen I, Cummings R.

Purpose

The primary purpose of the Nine Hole Peg Test (NHPT) is to provide a quantitative and objective measure of digital dexterity and gross motor speed of the hand and forearm. It serves as a crucial tool for clinicians, including occupational and physical therapists, to establish baseline motor function, monitor progress over time, and assess the impact of various medical conditions or interventions on hand function.

The NHPT is specifically sensitive to deficits resulting from conditions affecting the nervous system and the musculoskeletal system, such as stroke, multiple sclerosis, Parkinson’s disease, or various orthopedic injuries. By timing the task completion, the test yields a clear metric of functional performance speed, which is often inversely correlated with the severity of motor impairment.

Construct

The NHPT primarily measures the construct of fine manual dexterity, defined as the ability to coordinate small muscle movements, typically involving the fingers, hands, and wrists, in synchronization with the eyes. This involves complex processes such as grasping, manipulating, and releasing small objects with precision and speed.

The test relies on rapid, repetitive, and sequential actions that stress the kinematic and temporal aspects of motor control. Performance on the NHPT reflects the integrity of the peripheral and central nervous systems necessary for efficient motor planning, execution, and feedback mechanisms crucial for daily activities requiring skilled hand use.

Validity

The NHPT demonstrates strong construct validity, correlating highly with other standardized measures of hand function and manual dexterity, such as the Purdue Pegboard Test and the Box and Block Test. It is recognized for its ability to discriminate between healthy individuals and patient populations suffering from motor impairments.

Furthermore, the test exhibits robust ecological validity, as the required pinch and release movements are components of numerous essential activities of daily living (ADLs). Changes in NHPT scores often reflect clinically meaningful changes in a patient’s functional independence following treatment or disease progression.

Reliability

The Nine Hole Peg Test is known for its excellent reliability across various populations. High inter-rater and intra-rater reliability coefficients have been consistently reported due to the standardized setup and the objective, time-based scoring method, which minimizes subjective interpretation.

Studies evaluating test-retest reliability typically show high correlations, indicating that the NHPT provides stable measurements over short intervals, assuming no significant clinical change has occurred in the subject. This makes it a highly reliable instrument for longitudinal tracking in research and clinical practice.

Factor Analysis

While the NHPT is a single, timed performance measure, factor analysis studies often place it within a broader factor structure related to upper extremity motor function or fine motor speed. It typically loads heavily onto a factor representing rapid, alternating movements rather than strength or static coordination.

The simplicity of the task suggests it is a relatively unidimensional measure of dexterity speed. However, when used alongside measures of grip strength or sensory perception, it helps delineate the specific components of motor impairment contributing to overall functional limitations.

Instrument

Test Type: Instrumental / Performance-based assessment

Format: Physical apparatus requiring timed execution

Language Available: Non-verbal/Performance-based (Instructions are typically available in all major languages, but the test itself is language-independent).

Population Group: Adults, Elderly

Age Group: Typically 18 years and above, though modified versions exist for pediatric use.

Population Details: Used across a wide spectrum of patient populations, including those with neurological disorders (e.g., stroke, multiple sclerosis), orthopedic injuries (e.g., hand trauma, carpal tunnel syndrome), and rheumatological conditions.

Test Methodology: The subject sits at a table and is instructed to use only one hand (the dominant hand is usually tested first) to pick up the nine pegs, one at a time, and place them into the holes as quickly as possible. Once all pegs are placed, the subject must immediately remove them, one by one, and return them to the container. The elapsed time for the entire procedure (placement and removal combined) is recorded in seconds. The subject must repeat the procedure for the non-dominant hand. The original PDF outlining the methodology can be downloaded here: NHPT Instrument PDF. An explanatory form is also available here: NHPT Explanation Form PDF.

Keywords

Timed test, dexterity assessment, hand function, neurological rehabilitation, motor control, Kellor M, functional capacity, clinical outcome measure, fine motor skills.

Authors

Author ORCID Identifier: N/A (Information not provided)

Affiliation Email addresses: N/A (Information not provided)

Correspondence Address: N/A (Information not provided)

Permissions & Fee and Test Year

The Nine Hole Peg Test was first documented and standardized in 1971 by Kellor et al. The apparatus itself is commercially available through various medical and rehabilitation suppliers. As a non-proprietary performance measure, the procedure and scoring guidelines are generally available in the public domain, though specific commercially produced kits may require purchase. There are typically no per-use fees associated with the administration of the test itself.

Reference’s

• Kellor M, Frost J, Silberberg N, Iversen I, Cummings R. (1971). Hand strength and dexterity. Norms for the nine hole peg test. Perceptual and Motor Skills, 33(1), 227-230.
• Mathiowetz V, Weber K, Kashman N, Volland G. (1985). Adult norms for the Nine Hole Peg Test of finger dexterity. Occupational Therapy Journal of Research, 5(1), 24-38.
• Relevant clinical guidelines provided by the American Occupational Therapy Association (AOTA) and physical therapy organizations often cite the NHPT as a standard measure for rehabilitation outcomes.

Items of the Nine Hole Peg Test

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

De patiënt moet zo snel mogelijk 9 staafjes uit een bakje nemen en deze in de openingen in een bord steken. Vervolgens moet de patiënt de staafjes er weer uithalen en terug in het bakje leggen. Gemeten wordt de tijdsduur van de handeling. De patiënt mag alleen de te meten hand gebruiken en moet de procedure per staafje herhalen (hij mag dus niet in één keer alle staafjes pakken).