Reporting of the translation and cultural adaptation procedures of the Addenbrooke’s Cognitive Examination version III (ACE-III) and its predecessors: a systematic review
BMC Medical Research Methodology volume 17, Article number: 141 (2017)
The ACE-III, a gold standard for screening cognitive impairment, is restricted by language and culture, with no uniform set of guidelines for its adaptation. To develop guidelines a compilation of all the adaptation procedures undertaken by adapters of the ACE-III and its predecessors is needed.
We searched EMBASE, Medline and PsychINFO and screened publications from a previous review. We included publications on adapted versions of the ACE-III and its predecessors, extracting translation and cultural adaptation procedures and assessing their quality.
We deemed 32 papers suitable for analysis. 7 translation steps were identified and we determined which items of the ACE-III are culturally dependent.
This review lists all adaptations of the ACE, ACE-R and ACE-III, rates the reporting of their adaptation procedures and summarises adaptation procedures into steps that can be undertaken by adapters.
The Addenbrooke’s Cognitive Examination (ACE)  was developed in 1990 to act as a screening tool for detecting cognitive impairment while also incorporating the Mini Mental State Examination (MMSE) . It was designed to assess the five cognitive domains attention, memory, verbal fluency, language and visuospatial abilities, as well as provide an overall indication of cognitive function. It was later updated in 2006 to account for cross cultural usage and improved sensitivity , resulting in the development of the Addenbrooke’s Cognitive Examination Revised (ACE-R) . However, the ACE-R contained items that incorrectly indicated cognitive impairment and these were corrected in 2012, with sections of the MMSE removed due to copyright issues , resulting in the recent Addenbrooke’s Cognitive Examination Version III (ACE-III) .
The ACE-III is regarded as the gold standard for the screening and diagnostic accuracy of cognitive impairment . It consists of 19 items, takes 15–20 min to administer and 5 min to score, scores being out of 100, and a higher score indicating healthier cognitive functioning [6, 7]. The ACE-III retains many of the items originally found in the ACE-R and the ACE, and is considered a comprehensive screening tool for cognitive impairment , comparing favourably to other standard neuropsychological tests . It is not surprising therefore, that all three versions of the ACE [1, 4, 6] have been translated into various languages and are used widely across the globe. However, the ACE-III and its predecessors [1, 4, 6] have a key limitation. They have been designed for fluent English speakers aware of the cultural norms of the country where it was developed. Specific items such as verbal fluency and language require participants to read, speak, write and understand English [9,10,11].
Several translation and cultural adaptation procedures to produce suitable versions of psychometric instruments [1, 4, 6] are evidenced in the literature but there is an absence of a uniform set of guidelines to conduct the translation and adaptation of these instruments. The case of the ACE-III is not an exemption. At present, there is no formal guidance on the steps that should be undertaken in translating the ACE-III and its predecessors [1, 4, 6] into any given language and no official indication given as to which items of the ACE, ACE-R and ACE-III are culturally independent and which are culturally dependent and therefore may require a certain process to be appropriately adapted. The adaptation procedures for the ACE-III are fully dependent on replicating the procedures reported in previously published ACE adaptations. Yet, to the extent of our knowledge, there is no existing compilation of all the translation and culturally adaption procedures.
An important step for producing evidenced-based guidelines for the translation and cultural adaptation of the ACE-III is to conduct a systematic compilation of all the translation and culturally adaptation procedures undertaken by existing published versions of the ACE, ACE-R and ACE-III. This systematic review aims to meet this challenge. In this endeavour, we paid particular attention to recording the translation and cultural adaptation procedures reported by each publication because our primary focus was to identify the translation and cultural adaptation steps and processes and which items are deemed culturally dependent in which publication. To undertake this process as robustly as possible, we utilised two scales that assess the quality of reported translation and cultural adaptation, the Manchester Translation Reporting Questionnaire (MTRQ) and Manchester Cultural Adaptation Reporting Questionnaire (MCAR). These scales were applied to each publication to determine which report a procedure that can be successfully replicated by future cultural adapters of the ACE-III. We were able to produce a successful systematic review that lists all the existing translations and cultural adaptations of the ACE, ACE-R and ACE-III [1, 4, 6], and were able to rate all the reporting of their translation and cultural adaptation procedures on reliable scales that we have developed for public use. We were also able to extract all translation and cultural adaptation procedures from these publications, break them down and summarise them to allow for an understanding of what steps are most commonly undertaken by adapters. Such steps can be undertaken by future adapters when translating or culturally adapting the ACE-III for their purposes.
Our methods followed a previously conducted systematic review and a meta-analysis of the Addenbrooke’s Cognitive Examination (ACE) and its revised version (ACE-R) [12, 13]. The guidelines on the reporting of systematic reviews in the PRISMA statement were followed .
Due to the nature of the review the search was conducted using health care based electronic databases EMBASE, Medline and PsychINFO. The search terms were “addenbrooke's cognitive examination or ace-iii or screen* or test or instrument or measure or tool or diagnos*”, “dementia or Alzheimer* or cognitive”, and “sensitivity and specificity or accuracy or cut-off or receiver operator or ROC or Youden”. The search period was restricted from January 2013 to December 2015 as the first paper on the Addenbrooke’s Cognitive Examination Version III (ACE-III) was introduced in 2013 . SCOPUS was also searched to locate publications that have cited the original paper by Hsieh et al. . The search was run till 31st December 2016 to account for any new publications that could potentially meet our inclusion criteria but none were identified.
The searches were supplemented by screening all the included and excluded studies of Larner and Mitchell’s recent meta-analysis which examined the accuracy of ACE and ACE-R .
Publications that referred to translated and/or culturally adapted versions of the ACE, the ACE-R and the ACE-III, from English into any other language, and were the primary source of that version of the assessment, were included.
Publications that did not refer to a translated or culturally adapted version of the ACE, ACE-R or ACE-III were excluded.
The results of the searches in each database were exported to Endnote and duplicates were removed. Study selection was completed in two stages. First, the titles and abstracts of the identified studies were screened and subsequently the full-texts of relevant studies were accessed and further screened against the eligibility criteria. When the full texts were unavailable, the authors of the publications were contacted to provide additional information. A final attempt to obtain the publications was by contacting the respective journals and putting in a request. The full text of publications was read through by two authors individually (NM and MWW), who determined what language the ACE, ACE-R or ACE-III had been adapted to and extracted the section that described the translation and cultural adaptation process. The translation and cultural adaptation steps were identified in each extraction and separated.
The reported translation procedure of each publication was broken down into individual steps such that there was no overlap between two steps. The steps of all the publications were later merged and duplicates removed to create a list of all potential steps that could take place when translating the ACE, ACE-R and ACE-III. The reported cultural adaptation procedure of each publication was reviewed to identify which questions of the ACE, ACE-R and ACE-III were culturally dependent and how each question was appropriately adapted.
The quality of the reported translation and cultural adaptation procedures were assessed through the MTRQ and MCAR respectively. Both MTRQ and MCAR (See Fig. 1) are seven point rating scales that were developed at the Centre for Primary Care at the University of Manchester to quantify the overall quality of reported procedures undertaken in the translation or cultural adaptation of any assessment, in particular, neuropsychological assessments. In the development of these scales the quality of a described translation or cultural adaptation procedure is considered dependent on the extent to which it can be replicated successfully through the information it provides.
It is important to note that MTRQ and MCAR were designed to only account for reported translation and cultural adaptation procedures. Scores on the MTRQ and MCAR cannot assess the quality of the actual translation and cultural adaptation procedures that were potentially undertaken by adapters, only the manner in which they have reported it.
The reported translation and cultural adaptation procedures that were extracted by our two authors were also assessed by these authors independently, using the MTRQ and MCAR scales. At this stage an interrater reliability analysis, using the Kappa statistic, was performed to determine consistency among raters for both scales . Following this, scores between the two authors that did not match were reviewed by a third author (WW) and a consensus was reached after discussion to determine the final score to be assigned to that publication.
Our search identified 113 publications on the ACE, ACE-R and ACE-III (See Fig. 2 for the PRISMA flow diagram). The abstracts of the publications were screened and 63 publications were excluded as they only focused on the original English versions of the ACE, ACE-R and ACE-III [1, 4, 6]. Full texts of the remaining 50 publications were searched for, including contacting authors and journals, of which two were not available to us. The remaining 48 publications were reviewed and 16 of these were excluded as they were not the primary papers for their respective non-English versions of the ACE, ACE-R and ACE-III. After final application of the exclusion criteria, 32 papers were deemed suitable for the analysis; 12 for ACE, 17 for ACE-R and 3 for ACE-III (See Table 1 for details on the papers that were analysed).
Quality of translation and cultural adaptation reporting
The quality of the reported translation and cultural adaptation procedures were rated on the MTRQ and MCAR scales respectively (See Table 1 for the MTRQ and MCAR scores of the papers that were accessible to us in full text). The interrater reliability for the raters regarding the MTRQ was found to be Kappa = 0.242 (p > 0.001), 95% CI (0.426, 0.058). The interrater reliability for the raters regarding the MCAR was found to be Kappa = 0.581 (p < 0.001), 95% CI (0.797, 0.365) .
Reported translation and cultural adaptation
This review identified seven individual steps that can be undertaken when translating the ACE, ACE-R and ACE-III:
Translation: Direct translation, without any form of cultural adaptation, from English into the target language, often with the assistance of a native or fluent speaker of the language or an official translator. Eg. “Independently of one another, two members of our group translated the ACE into German” .
Back Translation: Creating a retroversion of the initial translation, from the target language back to English, often with the assistance of a native or fluent speaker of the language or an official translator. Eg. “First, the questionnaire was translated into Arabic, and then back translated into English. The process was then repeated until a consensus was reached about the optimal translation” .
Users in Coproduction: Potential or future users of the assessment, such as those from a target population, including native and fluent speakers of the language, providing feedback or information in any way that influences the development of the translated assessment. Eg. “There were […] cognitively healthy participants of age range 60–70 who were tested with Slovak ACE-R […]. Afterwards the participants were asked for a feedback especially on the questions where more possibilities were considered to be used in the final version” .
Expert Recommendations: Experts on translation, the target languages, or subject matters related to the assessment providing feedback or information in any way that influences the development of the translated assessment. Eg. “A review committee composed by two psychologists and two geriatricians chose the final version of the Italian ACE-R” .
Revisions based on step-by-step feedback: Constant and continuous revisions of the translated assessment developed whenever a change or suggestion is proposed and approved. Eg. “At different points of this process, members of the original team and Spanish speakers, suggested modifications ”.
Involvement of the original authors: Authors of the original assessment providing feedback or information in any way that influences the development of the translated assessment. Eg. “We translated and modified ACE-R with advice from the authors of the original version” .
Pilot Study: Administering translated versions of the assessment to assess its feasibility and acceptability amongst potential users. Eg. “The ACE plus 1 of the 3 new ACE-R versions were administered to patients who were examined by one of the authors (J.-C.B.) at the ERASME Hospital Memory Clinic” .
Out of the 32 papers only one, Custodio et al.  did not mention a translation process occurring at all, resulting in a score of 0 on the MTRQ. 3 of the papers (Dos Santos et al. , Kwak et al. , and Sarasola et al. ) mentioned that a translation process took place but not in enough detail to determine any individual steps or elaborate on the process. This is reflected in their receiving a score of 1 on the MTRQ.
Table 1 also shows the translation steps reported by the remaining 28 papers, indicating the frequency with which individual translation steps were reportedly undertaken. Only one paper, Gondova et al. , reported undertaking all the potential steps for translating that this review has identified. The remaining 27 papers reportedly undertook translation steps in various combinations; Translation was undertaken by all the papers, 16 papers undertook back translation, 5 papers reported users in coproduction, 7 papers approached experts for recommendations, 9 papers made revisions based on step-by-step feedback, 4 papers involved original authors and 14 papers conducted pilot studies.
Out of the 32 Machado et al.  and Ferreira et al.  did not mention a cultural adaptation process at all, resulting in a score of 0 on the MCAR. 2 papers, Kwak et al.  and Newman , mentioned that a cultural adaptation process took place but did not describe it, therefore receiving a score of 1 on the MCAR.
Table 2 shows which items of the ACE, ACE-R and ACE-III were reportedly culturally adapted by which of the remaining 28 papers, indicating the frequency with which individual items were culturally adapted across publications. Items 3: Attention and Concentration, 5b: Fluency - Animals, 15a: Visuospatial Abilities - Infinity Diagram, 15b: Visuospatial Abilities - Wire Cube and 16: Visuospatial Abilities were not culturally adapted across any of the papers as they only required direct translation. The remaining items were culturally adapted by various numbers of publications; Items 8: Language – Comprehension and 9: Language – Writing were culturally adapted in 1 paper, items 1: Attention - Orientation, 2: Attention - Registration, 4: Memory – Recall and 15c: Visuospatial Abilities - Clock in 2 papers, item 17: Visuospatial Abilities in 6 papers, items 5a: Fluency - Letters, 12: Language – Naming and 13: Language - Comprehension in 10 papers, item 11: Language Repetition in 13 papers, item 14: Language – Reading in 20 papers, item 10: Language - Repetition in 21 papers, item 7: Memory – Retrograde in 23 papers, item 18: Memory - Recall in 26 papers and item 6: Memory - Anterograde was culturally adapted in all 28 papers. Item 19: Memory - Recognition does not exist in the ACE but was culturally adapted in 16 papers out of the 17 ACE-R and ACE-III papers.
Out of the 32 papers that mentioned translation and cultural adaptation procedures in some level of detail, 16 papers elaborated further on their processes in terms of individuals involved. Table 3 further elaborates on who these individuals were and which papers reported on their involvement; 9 papers mentioned bilingual experts and researchers, 6 papers mentioned psychiatrists and psychologist, 3 papers mentioned accredited translators, 3 papers mentions experts in linguistics, 2 papers mentioned physicians and neurologists, 1 paper mentioned geriatricians, 1 paper mentioned speech therapists, 1 paper mentioned care givers and 1 paper mentioned test administrators.
Discussion and conclusions
Conclusively, our review summarises the reported translation and cultural adaptation procedures of the stated 32 publications, which can guide those who may want to translate and adapt the ACE-III in future. However, we were also able to successfully identify which of these publications reported procedures in sufficient detail for potential adapters to be able to replicate the process (See Table 1) through utilisation of the MTRQ and the MCAR. Inter rater reliability of the MTRQ was found to be fair and for the MCAR was found to be moderate , however, comparisons of the scores with a third author as a mediator and better understanding of the scales deemed the scores we assigned in this review as suitable ratings for the ACE, ACE-R and ACE-III publications. We can also determine from our scoring of the ACE, ACE-R and ACE-III publications, that the MTRQ and MCAR scores are not dependent on one another; a publication may score high on the MTRQ due to a high quality of reporting of the translation procedure and low on the MCAR due to a low quality of reporting of the cultural adaptation procedure and vice versa.
However, it is important to acknowledge that the MTRQ and the MCAR cannot assess the quality of translation or cultural adaptation of an assessment. As it focuses only on the reporting of the translation and adaptation procedure, not of the actual assessment itself, it can only determine if the quality of reporting is of a high standard. A publication may report the translation and cultural adaptation procedure in sufficient detail for it to be replicated, yet this may still result in the production of an inappropriate or poorly adapted assessment. Or, as is the case with our review, we accounted for translation steps and cultural adaptation processes that were reported across the 32 full text publications we had access to, not necessarily whether cultural adaptation or translation took place. Adapters of each non-English version of the ACE, ACE-R and ACE-III may have translated the assessment and culturally adapted questions and not mentioned it in their publications, resulting in a score of 1 or 0.
Despite this, having access to scales that can assess the quality of reporting of the translation and cultural adaptation procedures within publications provides future adapters with a crucial starting point to determine which publications’ procedures they should consider replicating, particularly when, as in the case of the ACE-III and its predecessors, there are no formal guidelines or instructions.
Overall, our review has provided an existing summation of all publications that introduce a translated and culturally adapted version of the ACE, ACE-R and ACE-III. A complete list such as this is a point of referral for designing future translation and cultural adaptations of the ACE-III and to locate any currently existing versions. However, we were not only able to identify all the existing publications, but also the translation and cultural adaptation procedures reported within these publications in their entirety.
A full list of independent translation steps were identified and defined which can be undertaken by future adapters and the frequency of the occurrence of each of these steps across the publications that reported translation steps, both in sufficient and insufficient detail, has been tabulated (See Table 1). We can see that direct translation was the most common step, undertaken by all the publications, followed by back translation, pilot studies, revisions based on step by step feedback, expert recommendations, users in coproduction and lastly, the involvement of original authors, which was reportedly only undertaken by four publications. The frequency of the translations steps across publications will allow future adapters to make judgement calls regarding which steps they may endeavour to undertake as this review highlights the translation steps that previous adapters sought to follow.
We were also able to identify which items were considered culturally dependent by which publications and which items were most likely to be culturally adapted. Table 2 successfully shows the frequency of reported cultural adaptation taking place across any non-English version of the ACE, ACE-R or ACE-III and for any given item of the ACE, ACE-R or ACE-III. For example, item 6: Memory – Anterograde has been culturally adapted in all 28 of the publications whereas item 15c: Visuospatial Abilities – Clock has only been reportedly culturally adapted in two publications. In the same way, Qassem et al.  and Yoshida et al.  were reportedly the most culturally adapted publications while Stokholm et al.  was the least. This will indicate to future adapters which items were prioritised for cultural adaptation by previous adapters.
The knowledge of which individuals were involved in the translation and cultural adaptation of each version were also extracted and described in Table 3. This provides information regarding who these individuals were most likely to be. This is particularly important as accurate replication of the reported translation and cultural adaptation procedures can only occur with existing knowledge of who was involved in adapting the assessment. Bilingual experts were most commonly involved, having been mentioned in 9 publications, followed by psychologists and psychiatrists, accredited translators, linguistic experts and physicians and neurologists. Geriatricians, speech therapists, care givers and test administrators were only involved in one publication each.
Overall, we were able to produce a successful systematic review that lists all the existing translations and cultural adaptations of the ACE, ACE-R and ACE-III [1, 4, 6], and were able to rate all the reporting of their translation and cultural adaptation procedures on reliable scales that we have developed for public use. We were also able to extract all translation and cultural adaptation procedures from these publications, break them down and summarise them to allow for an understanding of what steps are most commonly undertaken by adapters. Such steps can be undertaken by future adapters when translating or culturally adapting the ACE-III for their purposes.
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Alex J Mitchell, Andrew J Larner.
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Mirza, N., Panagioti, M., Waheed, M.W. et al. Reporting of the translation and cultural adaptation procedures of the Addenbrooke’s Cognitive Examination version III (ACE-III) and its predecessors: a systematic review. BMC Med Res Methodol 17, 141 (2017). https://doi.org/10.1186/s12874-017-0413-6