Development of a self-reporting questionnaire, BURMIG, to evaluate the burden of migraine
© Springer-Verlag 2008
Received: 21 May 2008
Accepted: 11 July 2008
Published: 19 August 2008
We developed a 77-item self-reporting questionnaire to assess the burden of migraine (BURMIG), including headache characteristics, migraine associated disability, comorbidities, management, and the consequences on the patients’ lives. We translated BURMIG into four languages (French, Portuguese, German and English) and tested it in 130 headache patients (20 pain clinic, 17 primary care and 93 general public) in Luxembourg. We performed a linguistic and a face-content validation and tested the questionnaire for its comprehensiveness, internal consistency and for its retest-reliability at an interval of 1 month (completion rates were 79.6 and 76.4%, for test and retest, respectively). Retest-reliability for the different parts of the questionnaire varied between 0.6 and 1.0 (Kappa coefficient), with an intracorrelation coefficient of 0.7–1.0. The internal consistency was between 0.74 and 0.91 (Cronbach’s alpha). The questionnaire BURMIG is suitable to evaluate the burden of migraine and can be used in English, German, French and Portuguese.
Migraine is a common and disabling neurobiological disorder  which is under-recognized and under-treated [2, 3]. It imposes a substantial health burden with nearly all migraine sufferers experiencing impairment of social activities and of work capacity [4, 5]. The World Health Report 2002  ranks migraine as number 12 in women and number 19 in both genders amongst all causes of disability in the world. In spite of this, it is estimated that only about 50% of migraine patients are diagnosed and, therefore, treated adequately [6–10]. There are a few validated questionnaires such as the ID migraine to diagnose migraine, and the migraine disability assessment score (MIDAS) to assess disability in the last 3 months, but there is no comprehensive questionnaire to assess migraine associated burden.
The physical and emotional impact of migraine on individual sufferers, their caretakers, family and colleagues is poorly acknowledged and this is true as well for the social and economic burden of migraine on society in comparison with those of other less prevalent, neurological disorders [9, 11–13].
We aimed to develop and validate a questionnaire to assess the burden of migraine after having translated it into the main languages in order to use it in subsequent studies in different linguistic populations.
We designed a questionnaire combining elements from established questionnaires and added further questions concerned with disease management and social consequences of headache. Priority areas for the questionnaire were defined with joint support from NGO’S (Swiss Migraine Trust Foundation, Migraine Action Association UK, Switzerland and Luxembourg), several international headache experts (see “Acknowledgements”) and the Luxembourg Ministry of Health. Ethics committee approval for the study was obtained from the National Ethic and Research Board of Luxembourg.
The resulting questionnaire contains 77 items, 17% of them are open questions. In the first part, the respondents are asked for biographical details such as age, gender, their most spoken language and their employment status. For the purpose of migraine diagnosis, the questions from “ID migraine”  are included. Specific information on headache, such as age of onset, the average number of headache days per month for the last 3 months, and symptoms before and after the headaches are gathered as well as information on general health, and previous and current disorders using items from the World Health Organization Disability Assessment Schedule II (WHODAS II) , the Migraine Disability Assessment Scale (MIDAS)  and the Patient Health Questionnaire-9 (PHQ-9) . Participants are asked about the influence of headaches on their job and family-life as well as whether they ever had consulted medical doctors, about the diagnosis that was made and about the medication that had been prescribed. Psychosocial circumstances having worsened the headaches, limitations in social activities, conceptions of headache and the need of support from health professionals to improve the headaches are also assessed.
Evaluation of the questionnaire
The testing of the questionnaire included face, content, and language validity; the stability of the questionnaire over 1 month, a period of time during which little or no change is expected (Test–retest reliability); the extent to which the questionnaire is able to discriminate between respondents with more or less severe disease status (construct validity) and the extent to which individual items in a questionnaire correlate with other items relating to the particular area of investigation (internal consistency). The respective methodology is detailed below.
Patients with headache were recruited from primary care centres, pain clinics and lay organisations. The idea behind this recruitment was to test the questionnaire in different settings. Selection for the primary care setting was done by doctors in general practice from the personal acquaintance of the project team. For the pain clinic setting the patients were selected from the pain clinic of the Centre Hospitalier de Luxembourg (Central Hospital in Luxembourg). When consulting because of headaches, both of these patient groups were asked by their physician to complete the questionnaire. For a third group of headache patients, headache sufferers with different employment settings were consecutively recruited by the national occupational health service and by a patient organisation.
The samples size needed to investigate internal consistency, construct validity and for test–retest reliability was estimated by using the kappa formula (see below). Assuming an absolute precision of 0.18 (given the validated parts of the questionnaire), we estimated that 73 responses to the main questions in the second test would enable a Kappa value of ≥0.5 to be detected with a power of 0.95 (two-tailed α = 0.05). Thus allowing for a 60% response rate, 135 subjects were considered necessary.
Face, content and language validity
Initial content validity was explored through systematic review by experts, and face validity was tested by pre-piloting with 23 volunteers. All questions which had not been used before in the respective language in validated questionnaires were translated using a forward–backward method with two different native translators. Comprehensiveness was piloted with native speaker volunteers.
Questions were categorized by the amount of change expected, as described previously for the development of a comparable questionnaire , primarily based on the time frame of the question and blinded to the results as follows: ‘no change expected,’ ‘change unlikely,’ ‘1 unit change expected,’ ‘3 unit change expected,’ ‘change likely’.
The data from the two periods of answering the questionnaire were compared to assess test–retest reliability. For categorical data, this was estimated by using agreement measures as percentage agreement, Kappa values, Mac Nemar’s S test and Bowker’s S test. Percentage agreement gives an estimate of within-patient agreement. The Kappa coefficient indicates when the observed agreement exceeds chance-agreement; a value above 0.6 is generally considered as acceptable. The Mac Nemar’s S provide a measure of agreement when used between two measures of the same questionnaire in the same patient. The null hypothesis of the Bowker’s S test is that the probabilities of cells in the square table satisfy symmetry. It was used for r × c tables where r > 2 or c > 2. For the questions with discrete integer data, intraclass correlation coefficient (ICC) was calculated using a 2-way random effects model for agreement.
Comparisons between these samples were made for the total scores of the WHODASII, MIDAS and PHQ9. Comparison between categorical scores of the three samples was performed by using a chi-square test. Continuous values of the scores were also used for comparison and a one-way ANOVA was used with the score as dependent variable. Normality was assessed with a Kolmogorov–Smirnov test; if significant, data were log-transformed and analysed if normally distributed. Otherwise, the Kruskall–Wallis test was used.
Where appropriate, cross-tabulations were used to check for internal consistency. Blocks of questions corresponding to ID, WHODASII, MIDAS and PH9 were compared in terms of correlations.
This was done in order to verify if they measure the same construct in a multilingual context and in the newly designed questionnaire. The Cronbach’s alpha coefficient was used to explore the overall consistency of the ID, WHODAS II, MIDAS and PHQ-9 questionnaires. The larger the overall alpha coefficient, the more likely that items contribute to a reliable scale. A value of 0.70 suggests an acceptable reliability coefficient; smaller reliability coefficients are seen as inadequate. A coefficient alpha after deleting each variable independently from the scale was calculated to determine how each item reflects the reliability of the scale. When the coefficient increases after an item is deleted from the scale, one can assume that the item is not correlated highly with other items in the scale. Conversely, if the coefficient decreases, it can be assumed that the item is highly correlated with other items in the scale.
Population and frequency of headache in the samples
Socio-demographic and headache characteristics of the validation sample
Year (mean ± SD)
38 ± 13
39 ± 10
43 ± 11
41 ± 11
Economic workers (%)
Migraine days/month (%)
Age of onset
Year (mean ± SD)
24 ± 10
20 ± 11
20 ± 10
20 ± 10
Out of 130 subjects of the whole population, 28 did not answer all the MIDAS questions leading to the unfeasibility to calculation of the total score. Thus, 102 subjects only had the total score. When re-running the comparison without the unhealthy subjects, only 10 subjects out the 28 had no total scores. Forty-nine subjects had the total score.
Completion rates for the items of the questionnaire varied between 5.83 and 100.00%. As the questionnaire included some questions with more than one possible choice or sub-questions, only the principal item was kept to evaluate questions with good completion rates. Thus, 63% questions were found to have completions rates of 90% or more. Questions where there were several choices tended to have completion rates around 10%. There was no difference for completion rates between genders and language groups. Completion rates of the second questionnaire varied from 5.41 to 100% and were very similar to the first questionnaire (63% of questions with completion ≥90%).
Out of the 130 subjects recruited for the validation process, 91 subjects replied a second time to the questionnaire sent 1 month later. Seventy-nine single items (including sub-questions) were used to assess reliability, excluding open questions; 67.1% of the items (n = 53) were over an 80% agreement, whereas 13.9% (n = 11) ranged between 60 and 80% and 19% (n = 15) were below a 60% agreement.
Test–retest reliability with percentage agreement and kappa values
P value for kappa
No change expected
±1 unit change expected
±3 unit change expected
Test–retest reliability with McNemar’s coefficient for 2 × 2 tables, Bowker’s coefficient for more than 2 classes variables and intraclass correlation for continuous variables
ID Migraine Screener™
WHODAS II questionnaire
Construct validity for frequency of headaches, MIDAS, and PH9 categorical scores
Whole population sample
General population sample
General population sample
N mean (days/month of headaches)
Less than 1 day
Minimal or infrequent disability
Mild or infrequent disability
Pairwise differences of WHODASII, MIDAS and PH9 scores between groups
General population sample
Without unhealthy subjects
General population sample
General population sample
General population sample
When further analysing pair-wise relationships between the three samples, differences (P < 0.05) were observed between the MIDAS score of the pain clinic sample and the general population sample when including all subjects, and also between the PHQ9 scores of the primary care and the general population sample (Table 6) when excluding incompletely healthy subjects from the general population sample.
The standardized values of the Cronbach’s alpha to test the consistency of (ID, WHODASII, MIDAS and PH9 tested in the new questionnaire were 0.26, 0.91, 0.74 and 0.84, respectively. Questions categorized by the amount of change expected and compared between the test and the retest time to assess the internal consistency showed a 80–100% agreement except for open questions where more than 70% change was observed (Electronic supplementary material).
We described the development and methodological testing of a self-reporting questionnaire to evaluate the burden of migraine in the general population.
Completion rates for each question were generally good with the vast majority between 60 and 90%. A small number of questions showed low completion rates which can be explained by the fact that they were part of multiple-choice questions. Some other questions did not have to be answered in all participants since they applied only to subgroups. Questions from WHODAS II and PHQ9 showed both, good completion rates, and good reliability. For methodological purposes, we had defined the amount of change expected for each question before administering the questionnaire. Questions, where a change had been expected, actually showed higher amounts of change and lower reliability. This means, that these items were used in an appropriate way and that they can be used as part of a questionnaire on the impact and burden of migraine and headaches. The question “Feeling tired or having little energy” from PHQ9 was found to have little re-test reliability at 1 month interval which can be explained by the transient character of this item.
Internal consistency was evaluated independently for each scale tested within in the questionnaire. It was found to be excellent for the MIDAS and somewhat smaller for questions from WHODASII and PHQ9.
Construct validity was found to be acceptable when samples were adequately chosen to discriminate between levels of headache. However, questions from WHODAS showed a poor discrimination between headache patients and the general population. This can be explained by the fact that this tool is not specifically designed for headache sufferers. The headache specific MIDAS, as expected, showed good discriminative power.
Regarding questions on disease management, agreement ranged from 77 to 98% (except for multiple-choice questions). Kappa coefficient ranged from 0.68 (0.62 with multiple-choice questions) to 1.00 which indicates good agreement between the two steps.
The majority of the questions about private and social influence were of the multiple-choice type and scored poorly in terms of percentage agreement (10–30%), but had a good retest reliability (kappa coefficients ranging from 0.52 to 0.97). These questions were therefore stable with time and could be used in a large study with a period of recruitment lasting a few months.
Changes brought to the final questionnaire
In the disease management part, two questions on medical doctor consultations were merged into one question allowing a better completion.
In one question on the temporal relation between headache and other problems, in addition to “before,” and “after” a third item “during” was added.
A new questionnaire, BURMIG, was developed with the aim to estimate the burden of migraine. It uses established and previously validated items for diagnosis and to measure disability and depression. Questions related to disease management and the influence on daily living were added. The resulting questionnaire was tested in a sample in the Grand Duchy of Luxembourg. Reliability and consistency of BURMIG were found to be comparable to previously published questionnaires. Therefore, this tool is suitable to study larger populations of headache patients.
The authors are indebted to all physicians, psychologist, pharmacists and patient organizations for their contributions to this study and are especially grateful for the help offered by T. Steiner, Ch. Pull, S. Chatterjis, R.Lipton, J. Schoenen, and A. Mc Gregor. We also thank particularly the ‘comité de pilotage’: Dr Alexandre Bisdorff, Hôpital Emil Mayrisch, Service Neurologie, Dr Catherine Boisanté, Centre Hospitalier, Centre De Traitement de la Douleur, Dr Robert Goerens, Direction de La Sante, Mme Marie-Anne Kaiffer, Patientevertriedung, Mme Marie-Lise Lair, Crp-Santé CES, Dr Nicole Majery, Service de Sante au Travail Multisectoriel, Mme Joséane Martens-Paulus, Syndicat des Pharmaciens, Dr René Metz, Centre Hospitalier, Service Neurologie, Prof Charles Pull, Centre Hospitalier, Service Psychiatrie Ambulatoire et de Liaison, Mme Véronique Schambourg, Syndicat des Pharmaciens, Dr Yolande Wagener, Direction de la Santé. The study was funded by the Luxembourg Ministry of Research and the Swiss Migraine Trust Foundation.
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