Maintaining independence is essential for quality of life, especially for older adults, patients undergoing rehabilitation and people living with an illness or physical limitation. To determine how much assistance a person needs in their daily life, healthcare professionals use different functional assessment scales.
One of the most widely used is the Barthel Index, which assesses a person’s ability to perform basic activities such as eating, dressing, moving around and using the toilet. Its score helps identify the level of dependency, monitor possible changes in independence and plan the necessary care or support.
In this article, we explain what the Barthel Index is, what it is used for, how its score is calculated and interpreted, and its main differences from the Katz Index.
What is the Barthel Index?
The Barthel Index is a functional assessment scale that measures a person’s level of independence in performing certain basic activities of daily living. It was published in 1965 by Florence Mahoney and Dorothea Barthel and is used particularly with older adults, patients with neurological conditions and people undergoing rehabilitation.
The scale assesses whether the person can perform each activity independently, requires some assistance or is completely dependent on another person. The result provides an overview of their physical independence and the support they may need in everyday life.
The original publication by Mahoney and Barthel introduced this tool as a functional assessment instrument related to rehabilitation and chronic illness.
What is the Barthel Index used for?
The Barthel Index is used to determine a person’s level of independence and how much assistance they need to perform basic activities of daily living. Its main uses include:
- Identifying situations of functional independence or dependency.
- Detecting the specific activities with which the person requires assistance.
- Planning care, support or rehabilitation programmes.
- Comparing functional progress at different points in time.
- Facilitating communication between healthcare and social care professionals.
- Adapting the person’s environment and routines to their needs.
The Spanish Ministry of Health includes the Barthel Index in its professional tool for frailty and fall prevention, where it is used to assess independence or dependency in basic activities of daily living.
The scale can be administered at the beginning of a rehabilitation process and repeated later to monitor progress. However, any change in the score should be interpreted by considering the person’s overall health, environment and the circumstances under which the assessment was conducted.
On its own, the result cannot identify the cause of a loss of independence or replace a comprehensive assessment, but it provides useful information for monitoring the person and adapting their care.
What activities does the Barthel Index assess?
The Barthel Index assesses ten basic activities of daily living, mainly related to self-care and mobility:
- Eating: assesses whether the person can eat independently or requires assistance.
- Washing or bathing: determines whether the person can perform their personal hygiene independently.
- Dressing: assesses the ability to put on and remove clothing, including managing buttons, zips and shoelaces.
- Grooming: includes activities such as washing the face, combing the hair, shaving and brushing the teeth.
- Bowel control: assesses bowel continence and the occurrence of episodes of incontinence.
- Bladder control: assesses urinary continence and, where applicable, the management of a catheter.
- Toilet use: assesses whether the person can access and use the toilet and clean themselves without assistance.
- Transferring between the bed and a chair: measures whether the person can complete this transfer independently or with assistance.
- Mobility: assesses the ability to walk or use a wheelchair.
- Going up and down stairs: determines whether the person can use stairs without assistance or supervision.
A publication hosted by the World Health Organization lists these ten areas when describing the use of the Barthel Index to assess activities of daily living in older adults.
The index focuses on basic activities. It does not assess more complex tasks such as cooking, shopping, managing medication, handling money or using public transport. These are known as instrumental activities of daily living and require other assessment tools.
How to calculate and interpret the Barthel Index
To calculate the Barthel Index, each activity is assigned a score according to the level of assistance the person requires. The individual results are then added together to obtain an overall assessment of their functional independence.
In the most widely used version, the result is expressed on a scale from 0 to 100. A high score indicates greater independence, while a low score reflects a greater need for assistance. Based on the result, the person may be considered independent or have a mild, moderate, severe or total level of dependency.
However, different versions of the scale exist, and the interpretation ranges may vary. Therefore, the criteria established for the specific version being used must be followed to calculate the Barthel Index correctly.
The scale should be administered and interpreted by a healthcare or social care professional as part of a broader assessment. The score is not a diagnosis and does not, by itself, determine the care a person requires.
Differences between the Barthel Index and the Katz Index
The Barthel Index and the Katz Index are both used to assess independence in basic activities of daily living, but there are several differences between them.
The Barthel Index assesses ten activities and provides a score that offers a more detailed indication of how much assistance a person requires. The Katz Index assesses six basic functions and classifies the person’s level of independence in a more general way.
| Barthel Index | Katz Index |
|---|---|
| Assesses ten basic activities | Assesses six basic functions |
| Provides a numerical score | Classifies different levels of independence |
| Can reflect more specific functional changes | Provides a more general assessment |
| Commonly used in rehabilitation and functional monitoring | Commonly used in the functional assessment of older adults |
The main difference between the Barthel Index and the Katz Index lies in the number of activities assessed and the way in which the results are expressed. The choice of scale depends on the context, the objectives of the assessment and professional judgement. In some cases, both may be used alongside other tools.
The original article on the Katz Index introduced this tool to assess independence in activities such as bathing, dressing, using the toilet, transferring, maintaining continence and eating.
Limitations of the Barthel Index
Although the Barthel Index provides useful information about physical independence, it does not offer a complete assessment of a person’s overall condition. The scale cannot determine the cause of dependency and does not specifically assess aspects such as memory, language, emotional well-being, communication or the social environment.
Therefore, a functional independence score alone cannot determine whether a person has any degree of cognitive impairment. Cognitive impairment must be assessed using other tests and by considering any observed changes in memory, orientation, language or reasoning.
The index also does not assess instrumental activities of daily living, which require greater planning and organisational skills. In addition, two people with the same score may require different types of support depending on the activities with which they experience difficulty, their environment and their health.
For this reason, the results should be complemented by other assessments and by the judgement of the professionals responsible for monitoring the person.
If a loss of independence is accompanied by frequent forgetfulness, disorientation, difficulty expressing oneself or problems organising familiar tasks, it is advisable to seek a professional assessment.
Functional independence and healthcare in older adults
A person’s independence may be influenced by their mobility, cognitive condition, illnesses, emotional well-being and living environment. Care during ageing should therefore be approached from a comprehensive and individualised perspective.
Maintaining an active routine, adapting physical activity to each person’s abilities, nurturing social relationships and following a balanced diet are some of the measures that may form part of this approach. It is also important to adapt the environment to promote safety and participation in everyday activities.
Physical ability and cognitive health are different dimensions, although both affect daily life. While the Barthel Index primarily assesses independence in performing basic activities, other assessments can analyse changes in memory, orientation and reasoning.
In the specific field of cognitive care, FontUp® is a food supplement formulated with EGCG from green tea extract. It should be regarded as part of a comprehensive strategy, together with a balanced diet, physical activity, cognitive stimulation and professional monitoring when necessary. It is not a substitute for medical treatment and does not play a role in the assessment of physical independence performed using the Barthel Index.
Conducting regular assessments makes it possible to identify new needs, adapt support and help the person retain the greatest possible degree of independence.
