Journal of Postgraduate Medicine Medknow Publications and Staff Society of Seth GS Medical College and KEM Hospital, Mumbai, India ISSN: 0022-3859 EISSN: 0972-2823 Vol. 53, Num. 2, 2007, pp. 102-107

Journal of Postgraduate Medicine, Vol. 53, No. 2, April-June, 2007, pp. 102-107

Original Article

Translation and validation of brief patient health questionnaire against DSM IV as a tool to diagnose major depressive disorder in Indian patients

Kochhar PH, Rajadhyaksha SS, Suvarna VR

Medical Advisor, Pfizer
Correspondence Address:Medical Advisor, Pfizer, puja.kochhar@pfizer.com

Date of Submission: 13-Sep-2006
Date of Decision: 09-Feb-2007
Date of Acceptance: 05-Mar-2007

Code Number: jp07038

Abstract

Keywords: Brief patient health questionnaire, depression, primary care, PRIME MD Today

Mental disorders in primary care though common, are frequently unrecognized and thus go untreated.[1] Studies have explored the clinical presentation of common mental disorders in primary healthcare settings. Among all psychiatric disorders detected in primary care units, depressive and anxiety disorders undoubtedly constitute a large proportion.[2],[3] Patients with depression, particularly those seen by primary care physicians, may report somatic symptoms, such as headache, constipation, weakness or back pain.[4],[5] Some previous studies have suggested that patients in non-Western countries are more likely to report somatic symptoms than are patients in Western countries.[4],[6],[7],[8] Moreover, patients from non-Western cultures and those of lower socioeconomic status are less willing or less able to express emotional distress.[4],[9],[10],[11]

Despite the enormity and increasing awareness regarding psychiatric morbidity, primary care physicians often find themselves unequipped to diagnose and handle depression since they may not be adequately trained.[12],[13] Several screening tools like self reporting questionnaire (SRQ), Hamilton depression rating scale (HDRS) and Beck depression inventory (BDI) have been studied in Indian patients.[14],[15],[16] Although there have been efforts towards developing screening instruments for common mental disorders in primary care, there is a need for a uniform user-friendly screening instrument to be made available to primary healthcare personnel across most regions in India. The original Prime-MD today (primary care evaluation of mental disorders) questionnaire was accordingly designed as an effective screening tool to assist the primary care physicians.[17] The present study was aimed to provide such a screening tool for depression, by translation of the elements of the brief patient health questionnaire (BPHQ) pertaining to diagnosis of depression, (derived from Prime-MD Today) into various Indian languages and validation against a DSM-IV diagnosis arrived at by a clinical interview conducted by a psychiatrist.

Materials and Methods

The development of the original Prime-MD Today questionnaire and also the present study in India was funded by Pfizer. The study was conducted by a group of eminent psychiatrists -The Prime-MD study group (principal investigators of the study). The study was conducted at 18 sites, in psychiatric and general clinics. The investigator was responsible for obtaining the Ethics Committee approval at the institution. Written informed consent was obtained from each subject prior to his/her participation in the study. The protocol was developed in consultation with the Prime-MD study group. Pfizer personnel were not involved in the conduct of this exercise. The participating sites are listed in [Table - 1].

Inclusion criteria: Patients (age>18 years) presenting with one or more of the following: Tiredness or weakness for > two weeks, multiple aches and pains without any obvious underlying organic causality, sleep disturbance for > two weeks, feeling down or worthless or recent noticeable weight change.

Exclusion criteria: Major medical disease or severe symptoms requiring immediate medical attention, pharmacotherapy which may alter patient′s responses, e.g., hypnotics, any psychotropic medication, any cognitive deficits or mental retardation.

The exercise was carried out for the following languages: Assamese, Bengali, Gujarati, Hindi, Kannada, Malayalam, Marathi, Oriya, Punjabi, Tamil, Telugu and Urdu. The validation was also carried out for the English version of the BPHQ.

Translation: The English version of the BPHQ was translated into Indian languages by experienced translaors affiliated to a major translator bureau (Bhasha Bharati). The relevant translation was reviewed by healthcare professionals, including a psychiatrist, familiar with the local language at each site. The questionnaire was also administered to 10 nonpatient volunteers at each site and their input on understandability of language obtained. The site provided comprehensive feedback on the BPHQ which was discussed with the translator and appropriate modifications incorporated into the BPHQ. This was back translated to ensure intact content. This BPHQ was then reviewed and proofread by a different translator for the final translated BPHQ. The translation process is depicted in [Figure - 1].

Validation

The validation exercise included approximately 300 subjects for each language. A psychiatrist and a psychiatry social worker / coordinator conducted the study under the supervision of the principal investigator. Subjects presenting to the general / medical and psychiatry outpatient clinics fulfilling the eligibility criteria were selected for further evaluation on obtaining consent. The subjects then completed the BPHQ and their response documented. In the event that the subject was illiterate, the BPHQ was read out to them without any modifications / explanations to the questionnaire. Subsequently they were referred to the study psychiatrists who were blinded to the results of the BPHQ. The psychiatrist conducted a detailed clinical interview and arrived at a DSM-IV diagnosis if relevant. This completed the study requirement for each subject and they were referred to the appropriate clinic for further follow-up or treatment. The BPHQ diagnosis and psychiatrist interview diagnosis were compiled for each subject by the coordinator. The validation process is depicted in [Figure - 2].

Statistical analysis

For each language, the presence or absence of a major depressive disorder (MDD) as diagnosed with the help of a patient-completed BPHQ and the psychiatrist DSM-IV diagnosis was matched. Kappa coefficient was used as the measure of agreement between the two diagnostic methods. The kappa statistic measures agreement above and beyond that expected by chance alone. The sample size calculation was based on the measure Kappa for MDD. It was expected that in the selected population of subjects who satisfied the eligibility criteria, the prevalence of depression would be around 50%. Based on the results in the PHQ Primary Care study,[1] it was expected that the Kappa would be around 0.6. To estimate the value of kappa in the population within an error of ±0.1 with 95% confidence and 80% power, a sample of size 246 was required for each of the languages considered. To ensure that data for at least 246 subjects would be available, 300 subjects were enrolled for each language.

A Kappa coefficient of < 0.5 was considered inadequate to confirm agreement between the two modalities of diagnosis irrespective of the sensitivity, specificity and overall accuracy. The analysis was carried out independently for each language. Other descriptive statistics such as sensitivity, specificity and overall accuracy were calculated. Data management was done independently by the Biometrics Division, Pfizer.

Results

The results of the validation exercise for all the languages are detailed in [Table - 2]. The sensitivity, specificity, overall accuracy and the kappa coefficient of agreement of the BPHQ instrument in comparison to psychiatrist DSM-IV diagnosis are tabulated.

Seven languages namely Hindi, Gujarati, Kannada, Telugu, Bengali, Tamil and Punjabi failed the validation exercise. These translations (except Punjabi) were reviewed and language modifications were made in consultation with site personnel and local language experts, enhancing comprehension. The updated versions, after review and proofreading were taken up for a re-run of the validation exercise. The results of the validation exercise on the updated BPHQ instruments in Hindi, Gujarati, Kannada, Telugu, Bengali and Tamil are tabulated in [Table - 3].

The languages in which the BPHQ instrument was successfully validated are listed in [Table - 4]. The validation exercise was unsuccessful for Punjabi and Urdu languages.

Discussion

The present study successfully translated and validated the BPHQ in 11 languages as a tool to assist the physicians for diagnosing depression [Figure - 3]. In developing countries such as India, major depression is projected to become the leading cause of disease burden by 2020. Although epidemiological data from large, well-conducted prevalence studies is lacking, depression is thought to be quite common throughout India. A cross-cultural study conducted by WHO to study the prevalence of mental disorders in primary care settings estimated the prevalence of depression in Bangalore to be 9.1%.[4] Extrapolating this to the population of India, the number is overwhelming. Thus, to maximize healthcare benefits, a combined effort from both psychiatrists and physicians would be desirable. Moreover, depressed patients commonly approach the physicians first, before seeking a psychiatric opinion. Diagnosing depression is the primary step in this context that requires adequate understanding of the presenting symptoms.

The original Prime MD Today questionnaire was accordingly designed as an effective screening tool to assist the primary care physicians.[17] The Prime MD Today consists of a Patient Health Questionnaire (PHQ) and a BPHQ. The PHQ is a four-page questionnaire which helps to assess depression, anxiety, alcohol, somatoform and eating disorders in addition to psychosocial stressors and women′s reproductive health. The BPHQ is a one-sheet questionnaire which helps to assess depression and panic disorders.[1] Prime MD Today has been developed keeping in mind the needs of busy clinicians. It is a simple, quick and reliable instrument, which facilitates rapid and accurate diagnosis of depression. This instrument also finds mention in reputed textbooks such as Harrison′s Principles of Internal Medicine[18] and Kaplan and Sadocks Comprehensive Textbook of Psychiatry.[19]

Internationally, Prime MD Today is available in English, Spanish, Greek, Italian and Vietnamese. To address the diversity in language and to suit the local needs, this study translated and validated the nine questions of the BPHQ pertaining to depression (PHQ-9), in a number of Indian regional languages with high sensitivity, specificity and accuracy. Patient questionnaires were translated in all major regional languages [Hindi, Marathi, Gujarati, Tamil, Malayalam, Kannada, Bengali, Oriya, Punjabi, Telugu and Assamese]. Each of these languages (including the English version) had been validated in approximately 300 patients per language leading to a total of> 3000 patients.

In the first attempt the validation exercise failed in seven out of 11 languages. On further review and analysis, the following factors were determined to have contributed to the variation in accuracy for various languages. The profile of patients may have contributed to the discrepancy between Kappa values for various languages. The accuracy was higher in languages that were validated in metro cities and this could be due to the awareness and ease of responding to such questionnaires.

Secondly, in terms of the language of the translation, the Hindi and Marathi language translations were reviewed and it was observed that the Hindi translation included qualifiers, which were missing in the English (original) and Marathi version. The language used though technically accurate was complex and sometimes difficult to understand. The BPHQ translations not being simple enough for the local population was a possibility. The language of these questionnaires was modified and simplified while maintaining the integrity and content of the questions.

The BPHQ is simple because patients themselves can fill in the questions. It is quick since the primary care physician (PCP) takes less than three minutes to review the filled-in questionnaire and make a diagnosis of MDD. It is reliable as it has been field tested and validated in more than 3300 patient samples. The result of the validation study shows high sensitivity (ability to detect true positive cases of MDD) and specificity (ability to detect true negative cases of MDD). The entire exercise was accomplished over two years. Subsequently, workshops have been conducted across the country by psychiatrists to train the PCPs regarding the use of the tool.

One of the limitations of this study is the inclusion of patients both from the general OPDs as well as psychiatry clinics. However conducting this exercise exclusively in a primary care setting would have made the logistics for the validation process against a detailed psychiatric interview extremely difficult, thus requiring its conduct in multidisciplinary institutes. Another limitation is lack of using standardized instruments (e.g., SCID or CIDI) for the diagnostic interview. This can be justified on the grounds that the aim of this exercise was to validate this questionnaire against an accepted form of clinical diagnosis in the real world setting by psychiatrists in India. The principal investigators in this study were experienced senior psychiatrists from renowned institutions having academic as well as research backgrounds.

Future research directions could be targeted towards employing this instrument in the field/primary care setting and comparing the results against a standardized diagnostic instrument. Another exercise could be using this instrument to assess the prevalence of MDD in various outpatient settings like diabetic and pain clinics. Moreover, it could also be studied for its utility as a prognostic tool to assess improvement following antidepressant medication over time.

The BPHQ should be administered to patients in whom underlying depression is suspected or to those complaining of recurrent somatic symptoms without any biological basis. The instrument can also be administered to patients with chronic disorders such as stroke, myocardial infarction and diabetes mellitus. It is estimated that MDD exists in 36% of patients with coexistent medical conditions and may be more common in hospitalized and elderly patients.[20]

Conclusion

Acknowledgments

This study was sponsored by Pfizer India. The authors wish to thank Mr. Chanderbhan Vasandani for study conduct and Dr. Chitra Lele from Biometrics, Dev Ops Pfizer India for data management, the patients and their relatives. We acknowledge and sincerely thank the investigators of the PRIME MD Study Group for their wholehearted support in the study.

Annexure

PRIME MD Study Group

Dr. Avasthi Ajit, Postgraduate Institute of Medical Education and Research, Chandigarh; Dr. Banerjee T. K, Clinic M, Calcutta; Dr. Bhagabathi Dipesh, Guwathi Medical College Hospital, Assam; Dr. ChandraKar Gopal, Mental Health, SCB Medical College, Cuttack; Dr. Chowdhury A. N, Institute of Psychiatry, Calcutta; Dr. Ghosal Malay, Medical College and Hospital, Calcutta; Dr. Krishnamurthy, Institute of Mental Health, Hyderabad; Dr. Mehta Manju, All India Institute of Medical Sciences, New Delhi; Dr. Mondol Dilip, R. G. Kar Medical College and Hospital, Calcutta; Dr. Pai Nagesh, K. S. Hegde Medical Academy, Mangalore; Dr. Parkar Shubhangi, King Edward Memorial Hospital, Mumbai; Dr. Raju N.N, Institute of Mental Health, Vishakhapatnam; Dr. Sathianathan R, Madras Medical College and Government General Hospital, Chennai; Dr. Sharma P. S. V. N, Kasturba Hospital, Manipal; Dr. Som S. K, Anantagram Hospital, Calcutta; Dr. Tharyan Pratap, Christian Medical College, Vellore; Dr. Trivedi J. K, Chhatrapati Shahuji Maharaj Medical University, Lucknow; Dr. Vankar G. K, B. J. Medical College and Civil Hospital, Ahmedabad

References

Copyright 2007 - Journal of Postgraduate Medicine

The following images related to this document are available:

Photo images