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A comparative analysis of role attainment and impairment in binge-eating disorder and bulimia nervosa: results from the WHO World Mental Health Surveys

Part of: Special Articles

Published online by Cambridge University Press:  19 September 2013

R.C. Kessler ,
V. Shahly ,
J.I. Hudson ,
D. Supina ,
P.A. Berglund ,
W.T. Chiu ,
M. Gruber ,
S. Aguilar-Gaxiola ,
J. Alonso  and
L.H. Andrade
...Show all authors
R.C. Kessler*
Affiliation:
Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts, USA
V. Shahly
Affiliation:
Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts, USA
J.I. Hudson
Affiliation:
Psychiatric Epidemiology Research Program, McLean Hospital and Harvard Medical School, Boston, Massachusetts, USA
D. Supina
Affiliation:
Health Economics, Outcomes Research and Epidemiology, Shire Pharmaceuticals, Wayne, Pennsylvania
P.A. Berglund
Affiliation:
University of Michigan, Institute for Social Research, Ann Arbor, Michigan, USA
W.T. Chiu
Affiliation:
Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts, USA
M. Gruber
Affiliation:
Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts, USA
S. Aguilar-Gaxiola
Affiliation:
University of California, Davis, Center for Reducing Health Disparities, School of Medicine, CTSC Building, Sacramento, California, USA
J. Alonso
Affiliation:
IMIM-Hospital del Mar Research Institute, Parc de Salut Mar; Pompeu Fabra University (UPF); and CIBER en Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain
L.H. Andrade
Affiliation:
Institute of Psychiatry, University of São Paulo Medical School, São Paulo, Brazil
C. Benjet
Affiliation:
Department of Epidemiologic and Psychosocial Research, National Institute of Psychiatry Ramón de la Fuente, Mexico City, Mexico
R. Bruffaerts
Affiliation:
Universitair Psychiatrisch Centrum – Katholieke Universiteit Leuven (UPC-KUL), campus Gasthuisberg, Leuven, Belgium
G. de Girolamo
Affiliation:
IRCCS Centro S. Giovanni di Dio Fatebenefratelli Brescia, Bologna, Italy
R. de Graaf
Affiliation:
Netherlands Institute of Mental Health and Addiction, Utrecht, The Netherlands
S.E. Florescu
Affiliation:
National School of Public Health, Management and Professional Development, Bucharest, Romania
J.M. Haro
Affiliation:
Parc Sanitari Sant Joan de Déu, CIBERSAM, University of Barcelona, Barcelona, Spain
S.D. Murphy
Affiliation:
School of Psychology, University of Ulster, Londonderry, Northern Ireland
J. Posada-Villa
Affiliation:
Universidad Colegio Mayor de Cundinamarca, Bogota, Colombia
K. Scott
Affiliation:
Department of Psychological Medicine, Otago University, Dunedin, New Zealand
M. Xavier
Affiliation:
Department of Mental Health – CEDOC and Faculdade Ciencias Medicas, Universidade Nova de Lisboa, Lisbon, Portugal
*
*Address for correspondence: R.C. Kessler, Department of Health Care Policy, Harvard Medical School, 180 Longwood Avenue, Boston, MA, USA. (Email: [email protected])
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Abstract

Background.

Cross-national population data from the WHO World Mental Health surveys are used to compare role attainments and role impairments associated with binge-eating disorder (BED) and bulimia nervosa (BN).

Methods.

Community surveys assessed 23 000 adults across 12 countries for BED, BN and ten other DSM-IV mental disorders using the WHO Composite International Diagnostic Interview. Age-of-onset was assessed retrospectively. Ten physical disorders were assessed using standard conditions checklists. Analyses examined reciprocal time-lagged associations of eating disorders (EDs) with education, associations of early-onset (i.e., prior to completing education) EDs with subsequent adult role attainments and cross-sectional associations of current EDs with days of role impairment.

Results.

BED and BN predicted significantly increased education (females). Student status predicted increased risk of subsequent BED and BN (females). Early-onset BED predicted reduced odds of current (at time of interview) marriage (females) and reduced odds of current employment (males). Early-onset BN predicted increased odds of current work disability (females and males). Current BED and BN were both associated with significantly increased days of role impairment (females and males). Significant BED and BN effects on adult role attainments and impairments were explained by controls for comorbid disorders.

Conclusions.

Effects of BED on role attainments and impairments are comparable with those of BN. The most plausible interpretation of the fact that these associations are explained by comorbid disorders is that causal effects of EDs are mediated through secondary disorders. Controlled treatment effectiveness studies are needed to trace out long-term effects of BED–BN on secondary disorders.

Keywords

Binge eatingbulimia nervosaeating disorderWHO World Mental Health Surveys
Type
Special Article
Information
Epidemiology and Psychiatric Sciences , Volume 23 , Issue 1 , March 2014 , pp. 27 - 41
Copyright
Copyright © Cambridge University Press 2013 

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References

Alonso, J, Chatterji, S, He, Y, ed. (2013). The Burdens of Mental Disorders: Global Perspectives from the WHO World Mental Health Surveys. Cambridge University Press: New York, NY.Google Scholar
American Psychiatric Association (2013). Diagnostic and Statistical Manual of Mental Disorders (DSM-V). American Psychiatric Association: Arlington, VA. (5th edn.)Google Scholar
Baker, M, Stabile, M, Deri, C (2001). What do self-reported, objective, measures of health measure? Journal of Human Resources 39, 1067–1093.CrossRefGoogle Scholar
Brambilla, F, Monteleone, P (2003). Physical complications and physiological aberrations in eating disorders: a review. In Eating Disorders (ed. Maj, M, Halmi, K, Lopez-Ibor, JJ and Sartorius, N), pp. 139–193. John Wiley & Sons: New York, NY.Google Scholar
Breslau, J, Miller, E, Jin, R, Sampson, NA, Alonso, J, Andrade, LH, Bromet, EJ, de Girolamo, G, Demyttenaere, K, Fayyad, J, Fukao, A, Galaon, M, Gureje, O, He, Y, Hinkov, HR, Hu, C, Kovess-Masfety, V, Matschinger, H, Medina-Mora, ME, Ormel, J, Posada-Villa, J, Sagar, R, Scott, KM, Kessler, RC (2011). A multinational study of mental disorders, marriage, and divorce. Acta Psychiatrica Scandinavica 124, 474–486.Google Scholar
Brownley, KA, Berkman, ND, Sedway, JA, Lohr, KN, Bulik, CM (2007). Binge eating disorder treatment: a systematic review of randomized controlled trials. International Journal of Eating Disorders 40, 337–348.Google Scholar
Bulik, CM, Sullivan, PF, Kendler, KS (2000). An empirical study of the classification of eating disorders. American Journal of Psychiatry 157, 886–895.CrossRefGoogle ScholarPubMed
Buntin, MB, Zaslavsky, AM (2004). Too much ado about two-part models and transformation? Comparing methods of modeling Medicare expenditures. Journal of Health Economics 23, 525–542.Google Scholar
Cain, AS, Bardone-Cone, AM, Abramson, LY, Vohs, KD, Joiner, TE (2008). Refining the relationships of perfectionism, self-efficacy, and stress to dieting and binge eating: examining the appearance, interpersonal, and academic domains. International Journal of Eating Disorders 41, 713–721.Google Scholar
Cameron, AC, Trivedi, PK (1998). Regression Analysis of Count Data. Cambridge University Press: New York, NY.Google Scholar
Center for Disease Control and Prevention (2004). Health, United States, 2004. National Center for Health Statistics: Atlanta, GA.Google Scholar
Dobson, AJ (2010). An Introduction to Generalized Linear Models, 2nd edn.CRC Press: Boca Raton, FL. (2nd edn.)Google Scholar
Eddy, KT, Crosby, RD, Keel, PK, Wonderlich, SA, le Grange, D, Hill, L, Powers, P, Mitchell, JE (2009). Empirical identification and validation of eating disorder phenotypes in a multisite clinical sample. Journal of Nervous and Mental Disease 197, 41–49.Google Scholar
Edwards, WS, Winn, DM, Kurlantzick, V, Sheridan, S, Berk, ML, Retchin, S, Collins, JG (1994). Evaluation of National Health Interview Survey diagnostic reporting. Vital and Health Statistics 2, 1–116.Google Scholar
Eum, K, Rice, KG (2011). Test anxiety, perfectionism, goal orientation, and academic performance. Anxiety, Stress, and Coping 24, 167–178.Google Scholar
Fairburn, CG, Cooper, Z, Doll, HA, Norman, P, O'Connor, M (2000). The natural course of bulimia nervosa and binge eating disorder in young women. Archives of General Psychiatry 57, 659–665.Google Scholar
Ferrier-Auerbach, AG, Martens, MP (2009). Perceived incompetence moderates the relationship between maladaptive perfectionism and disordered eating. Eating Disorders 17, 333–344.Google Scholar
Fichter, MM, Quadflieg, N, Hedlund, S (2008). Long-term course of binge eating disorder and bulimia nervosa: relevance for nosology and diagnostic criteria. International Journal of Eating Disorders 41, 577–586.Google Scholar
First, MB, Spitzer, RL, Gibbon, M, Williams, JBW (2002). Structured Clinical Interview for DSM-IV Axis I Disorders, Research Version, Non-patient Edition (SCID-I/NP). Biometrics Research, New York State Psychiatric Institute: New York, NY.Google Scholar
Forrester-Knauss, C, Zemp Stutz, E (2012). Gender differences in disordered eating and weight dissatisfaction in Swiss adults: which factors matter? BMC Public Health 12, 809.Google Scholar
Fragkos, KC, Frangos, CC (2013). Assessing eating disorder risk: the pivotal role of achievement anxiety, depression and female gender in non-clinical samples. Nutrients 5, 811–828.Google Scholar
Gerner, B, Wilson, PH (2005). The relationship between friendship factors and adolescent girls' body image concern, body dissatisfaction, and restrained eating. International Journal of Eating Disorders 37, 313–320.Google Scholar
Glynn Owens, R, Slade, PD (2008). So perfect it's positively harmful? Reflections on the adaptiveness and maladaptiveness of positive and negative perfectionism. Behavior Modification 32, 928–937.Google Scholar
Harkness, J, Pennell, BE, Villar, A, Gebler, N, Aguilar-Gaxiola, S, Bilgen, I (2008). Translation procedures and translation assessment in the World Mental Health Survey Initiative. In The WHO World Mental Health Surveys: Global Perspectives on the Epidemiology of Mental Disorders (ed. Kessler, RC and Üstün, TB), pp. 91–113. Cambridge University Press: New York, NY.Google Scholar
Haro, JM, Arbabzadeh-Bouchez, S, Brugha, TS, de Girolamo, G, Guyer, ME, Jin, R, Lepine, JP, Mazzi, F, Reneses, B, Vilagut, G, Sampson, NA, Kessler, RC (2006). Concordance of the Composite International Diagnostic Interview Version 3.0 (CIDI 3.0) with standardized clinical assessments in the WHO World Mental Health surveys. International Journal of Methods in Psychiatric Research 15, 167–180.Google Scholar
Hay, P (1998). The epidemiology of eating disorder behaviors: an Australian community-based survey. International Journal of Eating Disorders 23, 371–382.3.0.CO;2-F>CrossRefGoogle ScholarPubMed
Heeringa, SG, Wells, JE, Hubbard, F, Mneimneh, Z, Chiu, WT, Sampson, N (2008). Sample designs and sampling procedures. In The WHO World Mental Health Surveys: Global Perspectives on the Epidemiology of Mental Disorders (ed. Kessler, RC and Üstün, TB). Cambridge University Press: New York, NY.Google Scholar
Helfert, S, Warschburger, P (2013). The face of appearance-related social pressure: gender, age and body mass variations in peer and parental pressure during adolescence. Child and Adolescent Psychiatry and Mental Health 7, 16.Google Scholar
Herzog, W, Deter, HC, Fiehn, W, Petzold, E (1997). Medical findings and predictors of long-term physical outcome in anorexia nervosa: a prospective, 12-year follow-up study. Psychological Medicine 27, 269–279.Google Scholar
Hilbert, A, Pike, KM, Wilfley, DE, Fairburn, CG, Dohm, FA, Striegel-Moore, RH (2011). Clarifying boundaries of binge eating disorder and psychiatric comorbidity: a latent structure analysis. Behaviour Research and Therapy 49, 202–211.Google Scholar
Hosmer, DW, Lemeshow, S (2001). Applied Logistic Regression, 2nd edn.Wiley & Sons: New York, NY.Google Scholar
Hudson, JI, Hiripi, E, Pope, HG Jr., Kessler, RC (2007). The prevalence and correlates of eating disorders in the National Comorbidity Survey Replication. Biological Psychiatry 61, 348–358.Google Scholar
Hudson, JI, Lalonde, JK, Coit, CE, Tsuang, MT, McElroy, SL, Crow, SJ, Bulik, CM, Hudson, MS, Yanovski, JA, Rosenthal, NR, Pope, HG Jr. (2010). Longitudinal study of the diagnosis of components of the metabolic syndrome in individuals with binge-eating disorder. American Journal of Clinical Nutrition 91, 1568–1573.CrossRefGoogle ScholarPubMed
Johnson, JG, Cohen, P, Kasen, S, Brook, JS (2002). Eating disorders during adolescence and the risk for physical and mental disorders during early adulthood. Archives of General Psychiatry 59, 545–552.Google Scholar
Jones, DC, Crawford, JK (2006). The peer appearance culture during adolescence: gender and body mass variations. Journal of Youth and Adolescence 35, 243–255.Google Scholar
Kawakami, N, Abdulghani, EA, Alonso, J, Bromet, EJ, Bruffaerts, R, Caldas-de-Almeida, JM, Chiu, WT, de Girolamo, G, de Graaf, R, Fayyad, J, Ferry, F, Florescu, S, Gureje, O, Hu, C, Lakoma, MD, Leblanc, W, Lee, S, Levinson, D, Malhotra, S, Matschinger, H, Medina-Mora, ME, Nakamura, Y, Oakley Browne, MA, Okoliyski, M, Posada-Villa, J, Sampson, NA, Viana, MC, Kessler, RC (2012). Early-life mental disorders and adult household income in the World Mental Health Surveys. Biological Psychiatry 72, 228–237.CrossRefGoogle ScholarPubMed
Keel, PK, Brown, TA, Holm-Denoma, J, Bodell, LP (2011). Comparison of DSM-IV versus proposed DSM-5 diagnostic criteria for eating disorders: reduction of eating disorder not otherwise specified and validity. International Journal of Eating Disorders 44, 553–560.Google Scholar
Kessler, RC, Price, RH (1993). Primary prevention of secondary disorders: a proposal and agenda. American Journal of Community Psychology 21, 607–633.Google Scholar
Kessler, RC, Üstün, TB (2004). The World Mental Health (WMH) Survey Initiative Version of the World Health Organization (WHO) Composite International Diagnostic Interview (CIDI). International Journal of Methods in Psychiatric Research 13, 93–121.Google Scholar
Kessler, RC, Üstün, TB (2008). The WHO World Mental Health Surveys: Global Perspectives on the Epidemiology of Mental Disorders. Cambridge University Press: New York, NY.Google Scholar
Kessler, RC, Ormel, J, Demler, O, Stang, PE (2003). Comorbid mental disorders account for the role impairment of commonly occurring chronic physical disorders: results from the National Comorbidity Survey. Journal of Occupational and Environmental Medicine 45, 1257–1266.Google Scholar
Kessler, RC, Berglund, PA, Chiu, WT, Deitz, AC, Hudson, JI, Shahly, V, Aguilar-Gaxiola, S, Alonso, J, Angermeyer, MC, Benjet, C, Bruffaerts, R, de Girolamo, G, de Graaf, R, Haro, JM, Kovess-Masfety, V, O'Neill, S, Posada-Villa, J, Sasu, C, Scott, K, Viana, MC, Xavier, M (2013). The prevalence and correlates of binge eating disorder in the World Health Organization World Mental Health Surveys. Biological Psychiatry 73, 904–914.Google Scholar
Kinzl, JF, Traweger, C, Trefalt, E, Mangweth, B, Biebl, W (1999). Binge eating disorder in males: a population-based investigation. Eating and Weight Disorders 4, 169–174.Google Scholar
Knäuper, B, Cannell, CF, Schwarz, N, Bruce, ML, Kessler, RC (1999). Improving accuracy of major depression age-of-onset reports in the US National Comorbidity Survey. International Journal of Methods in Psychiatric Research 8, 39–48.Google Scholar
Knight, M, Stewart-Brown, S, Fletcher, L (2001). Estimating health needs: the impact of a checklist of conditions and quality of life measurement on health information derived from community surveys. Journal of Public Health Medicine 23, 179–186.Google Scholar
Leenaars, L, Lester, D (2006). Perfectionism, depression, and academic performance. Psychological Reports 99, 941–942.CrossRefGoogle ScholarPubMed
Levinson, D, Lakoma, MD, Petukhova, M, Schoenbaum, M, Zaslavsky, AM, Angermeyer, M, Borges, G, Bruffaerts, R, de Girolamo, G, de Graaf, R, Gureje, O, Haro, JM, Hu, C, Karam, AN, Kawakami, N, Lee, S, Lepine, JP, Browne, MO, Okoliyski, M, Posada-Villa, J, Sagar, R, Viana, MC, Williams, DR, Kessler, RC (2010). Associations of serious mental illness with earnings: results from the WHO World Mental Health surveys. British Journal of Psychiatry 197, 114–121.Google Scholar
Mitchell, JE, Crow, S (2006). Medical complications of anorexia nervosa and bulimia nervosa. Current Opinion in Psychiatry 19, 438–443.Google Scholar
Mond, JM, Hay, PJ (2007). Functional impairment associated with bulimic behaviors in a community sample of men and women. International Journal of Eating Disorders 40, 391–398.CrossRefGoogle Scholar
Ormel, J, Petukhova, M, Chatterji, S, Aguilar-Gaxiola, S, Alonso, J, Angermeyer, MC, Bromet, EJ, Burger, H, Demyttenaere, K, de Girolamo, G, Haro, JM, Hwang, I, Karam, E, Kawakami, N, Lepine, JP, Medina-Mora, ME, Posada-Villa, J, Sampson, N, Scott, K, Üstün, TB, Von Korff, M, Williams, DR, Zhang, M, Kessler, RC (2008). Disability and treatment of specific mental and physical disorders across the world. British Journal of Psychiatry 192, 368–375.Google Scholar
Pennell, B-E, Mneimneh, Z, Bowers, A, Chardoul, S, Wells, JE, Viana, MC, Dinkelmann, K, Gebler, N, Florescu, S, He, Y, Huang, Y, Tomov, T, Vilagut, G (2008). Implementation of the World Mental Health Surveys. In The WHO World Mental Health Surveys: Global Perspectives on the Epidemiology of Mental Disorders (ed. Kessler, RC and Üstün, TB), pp. 33–57. Cambridge University Press: New York, NY.Google Scholar
Perez, M, Warren, CS (2012). The relationship between quality of life, binge-eating disorder, and obesity status in an ethnically diverse sample. Obesity 20, 879–885.Google Scholar
Pomeroy, C, Mitchell, JE (2002). Medical complications of anorexia nervosa and bulimia nervosa. In Eating Disorders and Obesity: A Comprehensive Handbook (ed. Brownell, KD and Fairburn, CG), pp. 278–285. The Guilford Press: New York, NY.Google Scholar
Preti, A, Girolamo, G, Vilagut, G, Alonso, J, Graaf, R, Bruffaerts, R, Demyttenaere, K, Pinto-Meza, A, Haro, JM, Morosini, P (2009). The epidemiology of eating disorders in six European countries: results of the ESEMeD-WMH project. Journal of Psychiatric Research 43, 1125–1132.CrossRefGoogle ScholarPubMed
Quick, VM, Byrd-Bredbenner, C (2013). Eating Disorders Examination Questionnaire (EDE-Q): norms for US college students. Eating and Weight Disorders 18, 29–35.Google Scholar
Revicki, DA, Irwin, D, Reblando, J, Simon, GE (1994). The accuracy of self-reported disability days. Medical Care 32, 401–404.Google Scholar
Revicki, DA, Rentz, AM, Dubois, D, Kahrilas, P, Stanghellini, V, Talley, NJ, Tack, J (2004). Gastroparesis Cardinal Symptom Index (GCSI): development and validation of a patient reported assessment of severity of gastroparesis symptoms. Quality of Life Research 13, 833–844.Google Scholar
SAS Institute Inc (2008). SAS Software Version 9.2. SAS Institute Inc. Cary, NC.Google Scholar
Schoenborn, CA, Adams, PF, Schiller, JS (2003). Summary health statistics for the U.S. population: National Health Interview Survey, 2000. Vital and Health Statistics 10, 1–83.Google Scholar
Shapiro, JR, Berkman, ND, Brownley, KA, Sedway, JA, Lohr, KN, Bulik, CM (2007). Bulimia nervosa treatment: a systematic review of randomized controlled trials. International Journal of Eating Disorders 40, 321–336.Google Scholar
Striegel, RH, Bedrosian, R, Wang, C (2012). Comparing work productivity in obesity and binge eating. International Journal of Eating Disorders 45, 995–998.Google Scholar
Striegel-Moore, RH, Franko, DL (2008). Should binge eating disorder be included in the DSM-V? A critical review of the state of the evidence. Annual Review of Clinical Psychology 4, 305–324.Google Scholar
Striegel-Moore, RH, Silberstein, LR, Frensch, P, Rodin, J (1989). A prospective study of disordered eating among college students. International Journal of Eating Disorders 8, 499–509.Google Scholar
Striegel-Moore, RH, Cachelin, FM, Dohm, FA, Pike, KM, Wilfley, DE, Fairburn, CG (2001). Comparison of binge eating disorder and bulimia nervosa in a community sample. International Journal of Eating Disorders 29, 157–165.Google Scholar
Striegel-Moore, RH, Franko, DL, Thompson, D, Barton, B, Schreiber, GB, Daniels, SR (2005). An empirical study of the typology of bulimia nervosa and its spectrum variants. Psychological Medicine 35, 1563–1572.CrossRefGoogle ScholarPubMed
Sysko, R, Roberto, CA, Barnes, RD, Grilo, CM, Attia, E, Walsh, BT (2012). Test-retest reliability of the proposed DSM-5 eating disorder diagnostic criteria. Psychiatry Research 196, 302–308.Google Scholar
Thornton, C, Russell, J, Hudson, J (1998). Does the Composite International Diagnostic Interview underdiagnose the eating disorders? International Journal of Eating Disorders 23, 341–345.Google Scholar
Vazquez-Barquero, JL, Vazquez Bourgon, E, Herrera Castanedo, S, Saiz, J, Uriarte, M, Morales, F, Gaite, L, Herran, A, Üstün, TB (2000). [Spanish version of the new World Health Organization Disability Assessment Schedule II (WHO-DAS-II): initial phase of development and pilot study. Cantabria disability work group]. Actas Espanolas de Psiquiatria 28, 77–87.Google Scholar
Von Korff, M, Crane, PK, Alonso, J, Vilagut, G, Angermeyer, MC, Bruffaerts, R, de Girolamo, G, Gureje, O, de Graaf, R, Huang, Y, Iwata, N, Karam, EG, Kovess, V, Lara, C, Levinson, D, Posada-Villa, J, Scott, KM, Ormel, J (2008). Modified WHODAS-II provides valid measure of global disability but filter items increased skewness. Journal of Clinical Epidemiology 61, 1132–1143.CrossRefGoogle ScholarPubMed
Wade, TD, Keski-Rahkonen, A, Hudson, JI (2011). Epidemiology of eating disorders. In Textbook of Psychiatric Epidemiology, 3rd edn (ed. Tsuang, MT, Tohen, M and Jones, P). John Wiley & Sons: New York, NY.Google Scholar
Willett, JB, Singer, JD (1993). Investigating onset, cessation, relapse, and recovery: why you should, and how you can, use discrete-time survival analysis to examine event occurrence. Journal of Consulting and Clinical Psychology 61, 952–965.Google Scholar
Wolter, KM (1985). Introduction to Variance Estimation. Springer-Verlag: New York, NY.Google Scholar
Wonderlich, SA, Gordon, KH, Mitchell, JE, Crosby, RD, Engel, SG (2009). The validity and clinical utility of binge eating disorder. International Journal of Eating Disorders 42, 687–705.Google Scholar
World Bank (2012). Countries and economies. Data accessed June 5, 2012 at: http://data.worldbank.org/country.Google Scholar
World Health Organization (2013). WHO Disability Assessment Schedule 2.0. Accessed July 23, 2013 at: http://www.who.int/icidh/whodas/index.html.Google Scholar
Zachrisson, HD, Vedul-Kjelsas, E, Gotestam, KG, Mykletun, A (2008). Time trends in obesity and eating disorders. International Journal of Eating Disorders 41, 673–680.Google Scholar