Faces Pain Scale-Revised (FPS-R)

Abstract

The Faces Pain Scale-Revised (FPS-R) is a widely utilized self-report measure designed to quantify the subjective experience of pain intensity. Originating from the initial Faces Pain Scale (FPS), the revised version reduces the number of facial expressions from seven to six. This critical modification was implemented to standardize the scale’s scoring mechanism, allowing it to align directly with a 0 to 10 metric scale (where each face represents two intensity units, or 0, 2, 4, 6, 8, 10), thereby enhancing its comparability with other established pain assessment tools like the Numerical Rating Scale (NRS). The FPS-R features drawn faces ranging from a neutral expression (representing “no pain”) to a severely distressed expression (representing “worst possible pain”).

The instrument is particularly valuable for populations who may struggle with abstract numerical rating systems, such as young children, older adults with cognitive impairment, or individuals facing language barriers. It functions as a simple, visual aid that requires the respondent to point to the face that best represents their current level of discomfort.

Keywords

Faces Pain Scale-Revised, FPS-R, Pain intensity, Pediatric pain assessment, Self-report measure, Visual analog scale, Bieri, Hicks, Faces Pain Scale, Clinical assessment.

Authors

The original Faces Pain Scale (FPS) was developed by Bieri D, et al. in 1990. The revised and currently standard version, the Faces Pain Scale-Revised (FPS-R), was developed by Hicks CL, et al. in 2001. The development of the specific Dutch version was managed by the Mapi Research Trust.

Purpose

The primary purpose of the Faces Pain Scale-Revised (FPS-R) is to provide a reliable, non-verbal method for assessing the subjective intensity of pain across a broad range of clinical and research settings. It addresses the fundamental challenge of pain assessment, which relies heavily on patient self-report, by translating internal sensation into an easily discernible visual choice.

It is designed to be easily administered and understood, requiring minimal cognitive load from the respondent. By using universally recognizable facial expressions, the FPS-R ensures that the measurement of pain remains standardized and appropriate for diverse patient groups, including those who cannot use numerical or written scales effectively. The scale serves as a crucial tool for monitoring pain management efficacy and guiding clinical treatment decisions.

Construct

The FPS-R measures the psychological construct of pain intensity, which is defined as the magnitude or severity of the subjective painful experience at a specific moment in time. This is considered a unidimensional construct, meaning the scale is intended solely to capture how much pain an individual is experiencing, rather than the qualitative characteristics (e.g., stabbing, aching, burning).

The scale operates on the assumption that individuals can map their internal, subjective pain experience onto a continuum represented by the six discrete facial expressions. These expressions represent an ordinal progression of distress, which is then linearly mapped onto a metric scale (0-10) for quantitative analysis. The construct is rooted in the concept of self-report, where the patient is the ultimate authority on their pain experience.

Validity

The FPS-R has demonstrated robust concurrent validity, consistently showing strong correlations with other established measures of pain intensity, such as the Visual Analog Scale (VAS) and the Numerical Rating Scale (NRS), particularly in older children and adults. The revised six-face version (FPS-R) improved upon the original FPS by increasing the linear relationship between the faces and the assigned numerical scores, thereby strengthening its metric validity.

Furthermore, discriminant validity has been established, showing that the scale effectively differentiates between patients reporting different levels of pain (e.g., mild versus severe post-operative pain) and is sensitive to changes in pain following analgesic interventions. Its simplicity also contributes to high face validity, as patients and clinicians intuitively recognize the progression of pain represented by the facial expressions.

Reliability

The reliability of the FPS-R is generally considered high across various clinical populations. Studies examining test-retest reliability—the consistency of scores over a short period when pain levels are presumed stable—have yielded acceptable to strong coefficients, suggesting the scale provides stable measurements.

Due to its visual and self-report nature, the scale minimizes the potential for inter-rater variability, as the interpretation of the response (pointing to a face) is straightforward. When used correctly, the FPS-R provides a reliable indicator of pain intensity, making it a dependable tool for repeated assessments in chronic pain management and acute clinical monitoring.

Factor Analysis

As the Faces Pain Scale-Revised is designed to be a unidimensional measure of pain intensity, factor analytic studies typically support a single-factor structure. This structure confirms that all six items (faces) are measuring the same underlying construct—the severity of pain.

The primary goal of factor analysis applied to the FPS-R is not necessarily to reduce complexity, but rather to confirm that the sequential visual progression of the faces accurately reflects a linear increase in perceived pain intensity, thereby justifying its conversion to the 0-10 metric scale. This confirmation is crucial for ensuring the statistical integrity of the data collected using the instrument.

Instrument

Test Type: Observation / Self-Report Measure

Format: Visual, pictorial scale consisting of six drawn faces.

Language Available: Widely translated, including Dutch (as administered by Mapi Research Trust), English, and numerous others globally.

Population Group: Clinical and General Population. Used in contexts related to Sensory functions and pain.

Age Group: Children (typically 3 years and older), Older Adults, and Adults.

Population Details: Applicable for diverse populations, including those with cognitive limitations, limited literacy, or communication difficulties.

Test Methodology: The patient is asked to choose the face that best represents “how much pain they have right now.” The faces are scored 0, 2, 4, 6, 8, or 10.

The original PDF documents related to the FPS-R are available for download. The Explanation Form (Toelichtingsformulier) can be accessed here: FPS-R-form.pdf. The measurement instrument itself (Meetinstrument) can be downloaded here: FPS-R-meetinstr.pdf.

Keywords

Pain assessment, Self-report, Visual scale, Faces Pain Scale-Revised, Clinical settings, Children, Geriatrics, Unidimensional, Sensory function.

Authors

Author ORCID Identifier: N/A (Information not provided in source content).

Affiliation Email addresses: N/A (Information not provided in source content).

Correspondence Address: N/A (Information not provided in source content).

Permissions & Fee and Test Year

The original FPS was introduced in 1990 by Bieri D, et al. The definitive Faces Pain Scale-Revised (FPS-R) was introduced in 2001 by Hicks CL, et al. The scale is frequently used in clinical settings; however, researchers and clinicians should consult the Mapi Research Trust or the original authors’ affiliated institutions for current information regarding licensing, permissions, and associated fees for commercial or large-scale use.

Reference’s

• Bieri D, Reeve RA, Champion GD, Addicoat L, Ziegler M. (1990). The Faces Pain Scale for the self-assessment of the severity of pain experienced by children: development and testing. Pain, 41(2), 139-150.
• Hicks CL, von Baeyer CL, Spafford K, van Korlaar I, Goodenough B. (2001). The Faces Pain Scale-Revised: Toward a common metric in pediatric pain assessment. Pain, 93(2), 173-183.
• Mapi Research Trust. (Reference for the Dutch language version administration).

Items of the Faces Pain Scale-Revised (FPS-R) / Pijnschaal gezichten-herziene versie

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

The Faces Pain Scale-Revised (FPS-R) consists of six drawn faces showing increasing levels of pain intensity. These items are typically presented in sequence, accompanied by descriptive anchors:

1. Face 0: No Hurt (Score 0) – Neutral, smiling face.
2. Face 1: Hurts Just a Little Bit (Score 2) – Slightly worried face.
3. Face 2: Hurts Little More (Score 4) – Visibly distressed face, slight frown.
4. Face 3: Hurts Even More (Score 6) – Moderate distress, definite frown, perhaps tears visible.
5. Face 4: Hurts Whole Lot (Score 8) – Severe distress, mouth open in pain.
6. Face 5: Hurts Worst (Score 10) – Extreme distress, crying, representing the worst possible pain.