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Reliability and validity of the Turkish version of the Performance-Oriented Mobility Assessment I

Abstract

The Performance-Oriented Mobility Assessment (POMA)-I is widely used assessment tool for evaluation of balance and gait properties. The aim of this study was to translate POMA-I to Turkish and to assess its reliability and validity. People with amputated lower extremities using prosthetics, those who underwent orthopedic surgery within the last 6 months, those dependent on wheel chairs and also bed-ridden patients, subjects with dementia and Alzheimer’s disease, and illiterate people were excluded. After translation into Turkish, the Turkish version of the scale was applied on the participants at 2-week intervals. Volunteers ≥65 years of age were enrolled in the study. Internal consistencies of POMA subscale scores of postural balance and gait, and total score were calculated using Cronbach’s α coefficient. The Turkish version was evaluated with respect to inter- and intrarater reliability and test–retest reliability intraclass correlation coefficient (ICC). For validation, Pearson’s correlation coefficient between POMA and Berg Balance Scale (BBS) and Timed Up and Go Test (TUGT) was estimated. Eighty participants enrolled in the study with a mean age of 76.5 ± 6.75 years. In the reliability evaluation of the scale, considering postural balance, gait, and total score, Cronbach’s α coefficients were found to be 0.72, 0.83, and 0.88, respectively. ICCs were detected above 0.70 for test–retest reliability and also for interrater and intrarater reliability. In validation study POMA total score had a strong positive correlation with BBS total score (r = 0.86, p < 0.0001), and also a negative correlation with TUGT (r = −0.75, p < 0.0001). According to the results of this study, the Turkish version of the POMA-I scale has been found to be a reliable and a valid scale for elderly Turkish people.

Introduction

Age-related impairments in balance and postural control affect the safe performance of daily activities, and they are the primary reasons responsible for falls [1, 2]. Every year an average of 28–35% of the community-living older people (>65 years) are experiencing falls. This incidence increases to 50% up to 80 years of age. Falls are responsible for 10% of admissions to emergency rooms, and 6% of hospitalizations in people aged ≥65 years [36].

In many studies, risk factors for falls have been determined. These are classified as intrinsic and extrinsic factors. Muscular weakness of the lower extremities, decreased grip force, impaired postural balance, functional, and cognitive disorders, and visual problems constitute intrinsic factors, while extrinsic factors consist of multiple drug use (≥4 drugs) and environmental factors such as inadequate illumination, slippery floors, and lack of safety equipments in bathrooms. Besides, a decrease in the ability to perform daily living activities and usage of walking aids contribute to the frequency of falls [3, 5, 7].

Tests and functional scales used in proportion to variations in risk factors for falls, and excess numbers of components of postural control are also numerous [8]. One of these scales [Performance-Oriented Mobility Assessment (POMA)-I, see Appendix 1] was developed by Tinetti in 1986 so as to determine the risk of falls [9]. Within a few years (1986–1994), Tinetti made some modifications in the components of POMA to be used as an outcome measure in her research population, developed, tested, and released its various versions [1, 914]. Some maneuvers were included or excluded in compliance with the conditions of the population under investigation. These inclusions and exclusions were agreed upon in consideration of consensus among raters.

One of the most widely used versions of POMA is POMA-I or the Tinetti Assessment of Balance and Gait Scale. The POMA-I is used to evaluate older people’s ability to maintain postural balance and gait, to identify required interventions to remedy existing disabilities or to document the response to the treatment applied. It is composed of two separate categories as balance and gait tests [1519]. Balance and gait are evaluated with nine and eight items, respectively. Total score of balance category consists of sitting balance, balance on arising to stand, immediate standing balance (within first 5 s), standing balance, maintenance of balance when nudged, standing balance while eyes closed, balance when the subject turns 360° around him/herself, and tries to sit down from standing position is 16 points. Total score of the gait category which evaluates initiation of gait, step length and height, step symmetry and continuity deviation from a specified path, sways of patient’s trunk, and the position of heels while walking is 28 points. As a result, the total score of the scale amounts to 28 points. The highest score indicates the best performance [10]. The aims of this study are both to translate the original English version POMA-I scale into Turkish and also ensure its cross-cultural adaptation by the Turkish population in order to establish its validity and reliability.

Material and method

Etiler Nursing and Rest Home residents and attendants of the older people referred to our clinics (total n = 80; aged ≥65 years) who consented to participate were included in the study. Written informed consent was obtained from all participants. People with amputated lower extremities using prosthetic leg(s), those who underwent orthopedic surgery within the last 6 weeks, those dependent on wheel chairs and also bed-ridden patients, subjects with dementia and Alzheimer’s disease demonstrating difficulty in understanding commands, and illiterate people were excluded from the study.

Evaluation parameters

In the first examination, age, gender, educational level, occupation, existing diseases of the participants, walking aids used, and the number of falls within the last 6 months were recorded. Ambulatory status of the patients was evaluated using functional ambulation classification (FAC). FAC classifies ambulation in six separate levels as: level 0—nonfunctional ambulation and level 5—ambulator-independent ambulation [20]. Self-assessment scale of well-being evaluated health status of individuals on a five-item scale as: (1) I feel myself very well, (2) my general health status is fine, (3) my health state is of moderate degree, (4) I feel myself sick, and (5) I feel myself very sick.

Balance scale (Berg Balance Scale—BBS) was used for evaluation of balance, and also Timed Up and Go Test (TUGT) was used for measurement of functional mobility. BBS has been developed to be used for the evaluation of functional balance in older people, and it is efficiently employed in many fields of rehabilitation [15, 21, 22]. The BBS scale has been developed with the consideration of its fundamental role in the maintenance of different bodily postures during activities of daily life, self-driven spontaneous response to voluntary movements of the trunk and extremities, and postural control. It consists of 14 items. Scoring is done on 5 points allocated according to the ability of the individual to perform tasks independently and/or within a specified time interval. Scores range from 0 (inability to perform the task ) to 4 points ( ability to achieve the task independently within specifed time interval), and total score varies between 0 and 56 points [15, 16, 1819, 2123]. The BBS scale can be used also for stroke patients and cases with Parkinson’s disease or cerebral injuries, in addition to patients at fall risk [17, 23, 24]. The validity and reliability of the Turkish version of this scale which has received a global acceptance in the field of rehabilitation have been already established [23].

TUGT is an easy-to-use balance and gait scale not requiring professional expertise and training. In this test the patient sits in a armchair with a stiff back support whose seat is about 46 cm above the floor. A marker is placed 3 m away from the chair. The patient is told to stand from the sitting position, walk to the marker 3 m away, and then turn around and walk back to the chair, and sit down without hesitation. The time passed during this maneuver is recorded [2527].

Translation of the original scale into Turkish

Translation and cultural adaptation phases of the Turkish version of the scale were utilized according to previously published articles of Guillemin et al., Beaton et al., and recommendations of the EORTC Quality of Life Group [8, 28, 29].

At the first step POMA scale was translated independently into Turkish by two native Turkish speakers with a good command of English. Differences between these two Turkish translations were eliminated by a native speaker Turkish physiatrist with a good command of English, and a common Turkish version was formulated. At the second step, the Turkish version was retranslated into English by two native English speakers with a good command of Turkish. Differences between two translated texts were eliminated, and a satisfactory concordance between the Turkish and the original English version was ensured.

Cultural adaptation

After completion of the translation process, the Turkish version was evaluated by eight physiatrists, and ineligible guidelines were pinpointed and reported by each physiatrist individually. Two experienced physiatrists with a good command of English reevaluated ineligible guidelines and made appropriate modifications. The resultant translation was accepted as the final format of the Turkish version.

Reliability study

For the reliability study, the final Turkish version of POMA scale was applied on 80 participants. To establish its interrater reliability, 20 participants were randomized out of 80 and were tested the same day at 15–30-min intervals by two separate assessors. To determine intrarater reliability, 20 participants were randomized out of 80 and were evaluated by the same assessor two times (in the morning and afternoon) in the same day. For the determination of test–retest reliability, all participants were reevaluated 2 weeks after the first assessment.

Validation study

For construct validity, correlation of the Turkish version of POMA with BBS and TUGT was examined.

Statistical evaluatioın

Data obtained from this study were analyzed using SPSS 13.0 Statistical Package program. For the evaluation of demographic characteristics of the participants, descriptive statistical methods (means, standard deviation) were used. Internal consistency and inter- and intrarater reliability of the scale were estimated by using Cronbach’s α coefficient and intraclass correlation coefficient (ICC), respectively. ICC was calculated for the evaluation of test–retest reliability of the scale. Construct validity of the scale with BBS and TUGT was evaluated by using Pearson’s correlation. The results were assessed at a significance level of p < 0.05 with a 95% confidence interval.

Results

Eighty participants (64 women, 16 men) were enrolled in the study. Mean age of the participants including 43 housewives and 27 pensioners was 76.5 ± 6.75 years (min 65 years, max 95 years). Educational levels of the participants were as follows: primary school (n = 35; 43.8%), high school (n = 27; 33.8%), and university (n = 4; 5%). Sixteen participants (20%) had not ever attended a school, but all of them were literate. Participants were living in their own homes (n = 31, 38.8%), in an intimate’s home (n = 3, 3.8%), or in a nursing home (n = 46, 57.5%).

A medical problem was not encountered in seven participants. The remaining 73 participants had at least one and at most five concomitant diseases. The most frequently seen conditions were hypertension (n = 42), heart disease (n = 21), osteoarthritis (total n = 16; hip prosthesis n = 6, knee prosthesis n = 2), and osteoporosis (n = 14). Other concomitant conditions reported in participants were thyroid diseases, hyperlipidemia, cerebrovascular disease, cataract, epilepsy, vertigo, benign prostatic hyperplasia, Parkinson’s disease, renal failure, and pulmonary disease. When evaluated according to FAC, majority (n = 51, 63.8%) of the participants were fully independent (level 5). Nine subjects (11.3%, level 4) were independently ambulatory on a level floor, 13 patients (16.3%, level 3) were dependent under supervision. The remaining seven individuals (8.8%, level 2) were dependent on an assistant permanently or occasionally. Of the participants 76.3% evaluated their general health status as well or moderate.

Fifty-six (70%) participants did not use any walking aids, while the remaining participants used canes (n = 20; 25%), Lofstrand (n = 3; 3.6%), and walkers (n = 1; 1.2%). When the number of falls occurring within the last 6 months were interrogated, 58 (72.5%) of them did not mention any incident of fall, while 13 participants (16.3%) reported one fall incident.Scores assigned to the participants based on assessment scales during their first examinations were shown in Table 1.

The Cronbach’s α value estimated for internal consistency in the reliability test was above 0.70 for balance, gait, and total score (Table 2). Estimated inter- and intrarater ICC values for balance, gait, and total scores of the POMA scale were still above 0.70 (Table 3). Test–retest reliability analyses were performed for each item of the scale, and ICCs of the total score and subscale scores of balance and gait were calculated (Table 4).

ICCs estimated in the balance subscale for attempts to stand up from a sitting position (item 3), turn around 360° (item 8), in the walking subscale for step length and height (items 2,3), step symmetry (item 4), step continuity (item 5), and walk stance (item 8) ranged between 0.63 and 0.66, while ICCs were above 0.70 for other items. Total score was found to be 0.99. Construct validity was evaluated by using Pearson’s correlation. POMA total score had strong positive correlation with BBS total score (r = 0.86, p < 0.0001), and also negative correlation with TUGT (r = −0.75, p < 0.0001; Table 5).

Discussıon

Since balance is a multifactorial function, a single test cannot be sufficient for its evaluation. Different types of tests measure diverse aspects of postural control. Balance tests can be grouped based on their types. Static standing balance tests evaluate maintenance of balanced state while standing on different support platforms. However dynamic standing balance tests evaluate continuity of balanced state during movements requiring weight transfer [16, 29]. Sensorial manipulation tests assess various positions of the trunk and head, eye movements, and also limitations imposed on visual, vestibular, and somatosensorial functions. However tests evaluating functional balance are related to the scales of mobility and gait, sitting and standing, walking, and stepping over objects which involve ability to perform tasks requiring mobility of the body as a whole [16]. POMA is one of the functional scales used to assess fall risk and functions of postural balance which had been developed firstly in a study where falls had been evaluated prospectively [9].

Before the development of POMA, conventional approaches for the evaluation of mobility disorders were focused on either standard neuromuscular assessment methods (i.e., manual muscle test) or analytic estimations such as computerized gait analyses, while performance ability of the individuals was not rated. Tinetti proposed an assessment method based on direct observation of composite maneuvers involving ability of the individual to move safely within the boundaries of his/her vicinity. This method examines components of mobility which an individual might strive hard to perform during his/her daily living activities, and >investigates responses to varying degrees of difficulties imposed by certain maneuvers and at the same time helps to determine potential regulatory interventions such as organization of exercises and/or correction of domestic conditions so as to increase patient’s mobility [1, 9, 10]. POMA is an easy-to-use evaluation scale which can be completed after a few trials within less than 15 min and requires not more than a chair and a chronometer [30].

As is the case in other fields of rehabilitation, to obtain accurate and objective measurements from functional scales used in the evaluation of fall risks and balance impairments, these scales should have certain clinometric properties [8, 15, 31]. Reliability, validity, and sensitivity to change lead the way among these required characteristics. Implementation of the scales for diverse population groups requires, in addition to accurate translation cross-cultural validity, interpretation of the original scale in easily comprehensible terms for the target population and culture [8, 15, 31, 32]. During the process of cultural adaptation phase implemented after the Turkish translation of POMA, appropriateness of the terms used was examined. At this phase the translation of item 7 (“eyes closed at maximum position #6”) of the balance subscale posed a problem. At item 6 standing balance against a slight nudging is tested, and testing of the item 7 is required in case the subject has obtained the best score from testing in item 6. Therefore if the item 7 is translated into Turkish merely as “gözler kapalı (eyes closed),” it might mean testing individual’s balance against nudging while eyes closed. However when the Tinetti’s original text is reviewed, this item does not test individual’s balance when his/hes eyes closed, but it evaluates his/her standing balance. Therefore the translation of the item 7 was corrected as “standing balance while eyes closed.” In the English version of the scale, measurement units “inch” and “feet” are used. When these units are converted to centimeters and meters used in our country, whole numbers cannot be obtained. Therefore complying with the recommendations of the translation committee, values were expressed in both measurement units, and included in the relevant items in order to be faithful to the original version and render the scale more comprehensible.

Interrelated items of the scale assessing the same functional parameters (i.e., gait or balance) and each item which represents the conceptual frame to be evaluated in a way demonstrate internal consistency of the scale [33]. In our study, internal consistency of balance and gait subscales of POMA was calculated using Cronbach’s α coefficient which was 0.83 for balance, 0.72 for gait subscales, and 0.88 for the total score. These estimates demonstrate improved internal consistency of the POMA scale. In the literature any study estimating the internal consistency of POMA scale has not been encountered.

With prolongation of life expectancies, individuals are living longer senescent periods. Since during this relatively longer duration of time the elder people will be probably monitored by different physicians at various time spans, intra- and interrater reliabilities of the scales used should be established. POMA was firstly developed in 1986, and it was then applied on 15 ambulatory participants by two separate assessors and interrater reliability was evaluated. These two assessors were ≥90% in consensus for the scores assigned to the participants [9, 10, 15]. Besides, the POMA scores assigned to the patients were found to be correlated with parameters of musculoskeletal system and neurologic variables (muscular strength of the lower extremities, lumbar extension, neck examination findings, and self-reported mobility status of the patients). In our study, we calculated intraclass correlation coefficient for the study of inter- and intrarater reliability studies, and determined intrarater ICC values for subscale scores of balance (0.86), gait (0.80), and total score (0.86), respectively. ICC values of ≥0.70 are acceptable, and the values we obtained prove the reliability of the Turkish version [34]. In three separate studies involving old population where interrater reliability was tested, higher interrater ICC values of 0.75 and 0.97 were found [30, 3537]. Another study reported higher ICC values (>0.80) for both intra- and interrater reliability of the POMA scale in Parkinson’s disease [38]. In patients with amyotrophic lateral sclerosis, intra- and interrater reliability of the balance subscale were found to be excellent as assessed by ICCs (>0.90) [39].

The Test–retest reliability method means testing the scale used at short or long intervals depending on the components of the scale. For tests evaluating physical performance, instrument usage, and measurement of strength, this time interval should be at least 7 days. For test–retest correlation, usage of intraclass correlation method is advised. The test–retest correlation coefficient should be at least 0.80. Some authors reported that a reliability coefficient of 0.70 might be sufficient [34]. In related articles, ICC values for test–retest reliability of POMA scale were found to be 0.88 [36] and 0.93 [40] for total and balance subscale scores, respectively. In our study ICC values for test–retest reliability were above 0.80 (for balance subscale scores 0.88, CI 95% 0.83–0.92; gait subscale scores 0.92, CI 95% 0.87–0.94; and total score 0.94, CI 95% 0.90–0.95).

To demonstrate the validity of POMA scale, the BBS scale developed for the assessment of balance impairment in the elderly with its proven validity and reliability of the Turkish version was used [2123]. A very significant positive correlation was noted between POMA and BBS total scores (r = 0.86) and also balance (r = 0.84) and gait (r = 0.77) subscale scores. Previous studies conducted by Berg et al. [22, 23] also arrived at a similar conclusion (r = 0.91).

TUGT is used widely in the assessment and monitorization of functional mobility in the elderly. In our study, as an another indicator of validity, the correlation between POMA and TUGT scale which is an important tool in the evaluation of risks of fall and can be used in the assessment and monitorization of functional mobility, was investigated. A very significant negative correlation was found between total score, and also balance and gait subscales of POMA with the corresponding parameters of TUGT. This negative correlation means that in case of improvement of postural balance of the individual, higher POMA scores are obtained together with decreased time intervals required for the performance of TUGT tasks. Similarly, in a study conducted by Faber et al. [30], a significant association was found between TUGT and POMA total scores (r = −0.68), balance (r = −0.66), and gait subscale scores (r = −0.56). Also, in a study conducted by Cho et al. [41] a significant negative correlation was detected between total scores of POMA and TUGT (r = −0.65) [41].

In conclusion, in this study, POMA-I scale which is used widely in the prediction of postural balance and risk of fall in the elderly was translated into Turkish, and appropriateness of the Turksih version for the Turkish population was demonstrated. Based on the results of this study, the Turkish version of POMA-I scale was shown as a reproducible, reliable, and a valid scale.

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Acknowledgment

This study has been presented as poster paper in 17th European Congress European Rehabilitation, Quality, Evidence, Efficacy and Effectiveness. Thanks to Tinetti for her permission of POMA scale translation and validation.

Competing interests

The authors declare that they have no competing interests.

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Correspondence to Füsun Şahin.

Appendices

Appendix 1: Performance-Oriented Mobility Assessment-I—Tinetti Balance and Gait Evaluation

Appendix 2: Performansa Yönelik Hareket Değerlendirmesi I (POMA-I) Tinetti Denge ve Yürüme Değerlendirmesi

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Yücel, S.D., Şahin, F., Doğu, B. et al. Reliability and validity of the Turkish version of the Performance-Oriented Mobility Assessment I. Eur Rev Aging Phys Act 9, 149–159 (2012). https://doi.org/10.1007/s11556-012-0096-2

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Keywords

  • Elderly
  • Older people
  • Performance-Oriented Mobility Assessment
  • Reliability
  • Validity
{"cc_re__cc_re__cc_by_2_0": ["s\"><div class=\"c-article-section c-article-content-visibility\" id=\"rightslink-section\"><h2 class=\"c-article-section__title js-section-title js-c-reading-companion-sections-item\" id=\"rightslink\">Rights and permissions</h2><div class=\"c-article-section__content\" id=\"rightslink-content\">\n                <p>\n<b>Open Access</b> \n This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution License (\n  <a href=\"https://creativecommons.org/licenses/by/2.0\" rel=\"license\">https://creativecommons.org/licenses/by/2.0</a>\n  ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.\n  </p>\n              <p class=\"c-article-rights\"><a data-track=\"click\" data-track-action=\"view rights and permissions\" data-track-label=\"link\" href=\"https://s100.copyright.com/AppDispatchServlet?title=Reliability%20and%20validity%20of%20the%20Turkish%20version%20of%20the%20Performance-Oriented%20Mobility%20Assessment%20I&"], "copyright__copyright__copyright": ["", "", "s article\n\nCite this article\n\nY\u00fccel, S.D., \u015eahin, F., Do\u011fu, B. et al. Reliability and validity of the Turkish version of the Performance-Oriented Mobility Assessment I. Eur Rev Aging Phys Act 9, 149\u2013159 (2012). https://doi.org/10.1007/s11556-012-0096-2\n\nDownload citation\n\n  \u2022 Received:\n\n  \u2022 Accepted:\n\n  \u2022 Published:\n\n  \u2022 Issue Date:\n\n  \u2022 DOI: https://doi.org/10.1007/s11556-012-0096-2\n\nKeywords\n\n  \u2022 Elderly\n  \u2022 Older people\n  \u2022 Performance-Oriented Mobility Assessment\n  \u2022 Reliability\n  \u2022 Validity", "s article\n\nCite this article\n\nY\u00fccel, S.D., \u015eahin, F., Do\u011fu, B. et al. Reliability and validity of the Turkish version of the Performance-Oriented Mobility Assessment I. Eur Rev Aging Phys Act 9, 149\u2013159 (2012). https://doi.org/10.1007/s11556-012-0096-2\n\nDownload citation\n\n  \u2022 Received:\n\n  \u2022 Accepted:\n\n  \u2022 Published:\n\n  \u2022 Issue Date:\n\n  \u2022 DOI: https://doi.org/10.1007/s11556-012-0096-2\n\nKeywords\n\n  \u2022 Elderly\n  \u2022 Older people\n  \u2022 Performance-Oriented Mobility Assessment\n  \u2022 Reliability\n  \u2022 Validity", "s article\n\nCite this article\n\nY\u00fccel, S.D., \u015eahin, F., Do\u011fu, B. et al. Reliability and validity of the Turkish version of the Performance-Oriented Mobility Assessment I. Eur Rev Aging Phys Act 9, 149\u2013159 (2012). https://doi.org/10.1007/s11556-012-0096-2\n\nDownload citation\n\n  \u2022 Received:\n\n  \u2022 Accepted:\n\n  \u2022 Published:\n\n  \u2022 Issue Date:\n\n  \u2022 DOI: https://doi.org/10.1007/s11556-012-0096-2\n\nKeywords\n\n  \u2022 Elderly\n  \u2022 Older people\n  \u2022 Performance-Oriented Mobility Assessment\n  \u2022 Reliability\n  \u2022 Validity", "s article\n\nCite this article\n\nY\u00fccel, S.D., \u015eahin, F., Do\u011fu, B. et al. Reliability and validity of the Turkish version of the Performance-Oriented Mobility Assessment I. Eur Rev Aging Phys Act 9, 149\u2013159 (2012). https://doi.org/10.1007/s11556-012-0096-2\n\nDownload citation\n\n  \u2022 Received:\n\n  \u2022 Accepted:\n\n  \u2022 Published:\n\n  \u2022 Issue Date:\n\n  \u2022 DOI: https://doi.org/10.1007/s11556-012-0096-2\n\nKeywords\n\n  \u2022 Elderly\n  \u2022 Older people\n  \u2022 Performance-Oriented Mobility Assessment\n  \u2022 Reliability\n  \u2022 Validity"]}