Skip to main content

Advertisement

Log in

Interpreting the WHOQOL-Brèf: Preliminary Population Norms and Effect Sizes

  • Published:
Social Indicators Research Aims and scope Submit manuscript

Abstract

Since publication use of the WHOQOL-Brèf has rapidly risen. However, as yet no population norms have been published as a reference point against which researchers can interpret their findings. This study provides preliminary population norms for this purpose. Randomly sampled community residents from two studies were pooled and used to examine the properties of the WHOQOL-Brèf by age group, gender and health status. The results showed that general norms for the WHOQOL-Brèf domains were 73.5 (SD=18.1) for the Physical health domain, 70.6 (14.0) for Psychological wellbeing, 71.5 (18.2) for Social relationships and 75.1 (13.0) for the Environment domain. In general scores declined slightly by age group. For females scores were stable across the lifespan with an accelerated decline after the age of 60 years. Males exhibited a more consistent and even decline across the lifespan. There were significant differences in WHOQOL-Brèf scores when reported by health status, with those in poor health obtaining scores that were up to 50% lower than those in excellent health. Effect sizes between different health status levels are reported. These preliminary norms and effect sizes may be used as reference points for interpreting WHOQOL-Brèf scores. They provide additional information to the numerous national studies already reporting on the validity of the WHOQOL-Brèf.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  • InstitutionalAuthorNameABS (1995) National Health Survey: SF-36 Population Norms Australia Bureau of Statistics Australia. Canberra

    Google Scholar 

  • M. Amir R. Lev-Wiesel (2003) ArticleTitle‘Time does not heal all wounds: quality of life and psychological distress of people who survived the holocaust as children 55 years later’ Journal of Traumatic Stress 16 295–299 Occurrence Handle10.1023/A:1023756326443

    Article  Google Scholar 

  • M. Amir N. Lewin-Epstein G. Becker D. Buskila (2002) ArticleTitle‘Psychometric properties of the SF-12 (Hebrew version) in a primary care population in Israel’ Medical Care 40 918–928 Occurrence Handle10.1097/00005650-200210000-00009

    Article  Google Scholar 

  • Bittencourt C. Adves Filho M. Mazzali N. Santos (2004) ArticleTitle‘Quality of life in renal transplant patients: impact of a functioning graft’ Revista de Saude Publica 38 732–734

    Google Scholar 

  • F. Bolsche U. Hasenbein H. Reissberg A. Schlote C. W. Wallesch (2003) ArticleTitle‘Results of in- vs outpatient post-stroke rehabilitation over 6 months’ Fortschritte der Neurologie Psychiatrie 71 458–468 Occurrence Handle10.1055/s-2003-42187

    Article  Google Scholar 

  • S. J. Bowman D. A. Booth R. G. Platts (2004) ArticleTitle‘Measurement of fatigue and discomfort in primary Sjogren’s syndrome using a new questionnaire tool’ Rheumatology (Oxford) 43 758–764 Occurrence Handle10.1093/rheumatology/keh170

    Article  Google Scholar 

  • P. Brieger S. Rottig A. Marneros (2004) ArticleTitle‘Quality of life in unipolar depressive and bipolar affective patients’ Psychiatrische Praxis 31 304–309 Occurrence Handle10.1055/s-2003-814901

    Article  Google Scholar 

  • M. Bullinger J. Alonso G. Apolone A. Leplège M. Sullivan S. Wood Dauphinee B. Gandek A. Wagner N. Aaronson P. Bech S. Fukuhara S. Kaasa J. E. Ware SuffixJr. (1998) ArticleTitle‘Translating health status questionnaires and evaluating their quality: the IQOLA Project approach. International Quality of Life Assessment’ Journal of Clinical Epidemiology 51 913–923 Occurrence Handle10.1016/S0895-4356(98)00082-1

    Article  Google Scholar 

  • G. W. Chan G. S. Ungvari D. T. Shek J. J. Leung Dagger (2003) ArticleTitle‘Hospital and community-based care for patients with chronic schizophrenia in Hong Kong Quality of life and its correlates’ Social Psychiatry and Psychiatric Epidemiology 38 196–203 Occurrence Handle10.1007/s00127-003-0616-5

    Article  Google Scholar 

  • P. K. Chand S. K. Mattoo P. Sharan (2004) ArticleTitle‘Quality of life and its correlates in patients with bipolar disorder stabilized on lithium prophylaxis’ Psychiatry and Clinical Neurosciences 58 311–318 Occurrence Handle10.1111/j.1440-1819.2004.01237.x

    Article  Google Scholar 

  • P. S. Chandra S. Deepthivarma K. R. Jairam T. Thomas (2003) ArticleTitle‘Relationship of psychological morbidity and quality of life to illness-related disclosure among HIV-infected persons’ Journal of Psychosomatic Research 54 199–203 Occurrence Handle10.1016/S0022-3999(02)00567-6

    Article  Google Scholar 

  • M. H. Chapin S. M. Miller J. M. Ferrin F. Chan S. E. Rubin (2004) ArticleTitle‘Psychometric validation of a subjective well-being measure for people with spinal cord injuries’ Disability and Rehabilitation 26 1135–1422 Occurrence Handle10.1080/09638280410001714772

    Article  Google Scholar 

  • P. K. Chopra J. W. Couper H. Herrman (2004) ArticleTitle‘The assessment of patients with long-term psychotic disorders: application of the WHO Disability Assessment Schedule II’ Australian and New Zealand Journal of Psychiatry 38 753–759 Occurrence Handle10.1111/j.1440-1614.2004.01448.x

    Article  Google Scholar 

  • J. Cohen (1988) Statistical Power Analysis for the Behavioural Sciences Lawrence Erlbaum Hillsdale

    Google Scholar 

  • S. Crystal D. Shea (Eds) (2003) Focus on Economic Outcomes in Later Life: Public Policy, Health, and Cumulative Advantage Springer New York

    Google Scholar 

  • G. De Girolamo P. Rucci P. Scocco A. Becchi F. Coppa A. D’Addario E. Daru D. de␣Leo ParticleDe L. Galassi L. Mangelli C. Marson G. Neri L. Soldani (2000) ArticleTitle‘Quality of life assessment: validation of the Italian version of the WHOQOL-Bref ’ Epidemiology and Psychiatrical Society 9 45–55

    Google Scholar 

  • E. Diener E Suh R. Lucas H. Smith (1999) ArticleTitle‘Subjective well-being: three decades of progress’ Psychological Bulletin 125 276–302 Occurrence Handle10.1037/0033-2909.125.2.276

    Article  Google Scholar 

  • S. Dogan O. Dogan H. Tel F. Coker O. Polatoz F. B. Dogan (2004) ArticleTitle‘Psychosocial approaches in outpatients with schizophrenia’ Psychiatric Rehabilitation Journal 27 279–282

    Google Scholar 

  • P. J. Dorman J. Slattary B. Farrell M. S. Dennis P. A. Sandercock (1997) ArticleTitle‘A randomised comparison of the EuroQol and Short Form-36 after stroke. United Kingdom collaborators in the International Stroke Trial’ British Medical Journal 315 461

    Google Scholar 

  • R. Eckersley (2000a) ArticleTitle‘The mixed blessings of material progress: diminishing returns in the pursuit of happiness’ Journal of Happiness Studies 1 267–292 Occurrence Handle10.1023/A:1010040010239

    Article  Google Scholar 

  • R. Eckersley (2000b) ArticleTitle‘The state and fate of nations: implications of subjective measures of personal and social quality of life’ Social Indicators Research 52 3–27 Occurrence Handle10.1023/A:1007071621613

    Article  Google Scholar 

  • M. L. Essink-Bot L. Royen Particlevan P. Krabbe G. J. Bonsel F. F. Rutten (1995) ArticleTitle‘The impact of migraine on health status’ Headache 35 200–206 Occurrence Handle10.1111/j.1526-4610.1995.hed3504200.x

    Article  Google Scholar 

  • C. T. Fang P. C. Hsiung C. F. Yu M. Y. Chen J. D. Wang (2002) ArticleTitle‘Validation of the World Health Organization quality of life instrument in patients with HIV infection’ Quality of Life Research 11 753–762 Occurrence Handle10.1023/A:1020870402019

    Article  Google Scholar 

  • D. Feeny G. Torrance W. Furlong (1996) ‘Health utilities index’ B. Spilker (Eds) Quality of Life and Pharmacoeconomics in Clinical Trials Lippincott-Raven Publishers Philadelpha

    Google Scholar 

  • M. P. Fleck S. Louzada M. Xavier E. Chachamovich G. Vieira L. Santos V. Pinzon (1999) ArticleTitle‘Application of the Portuguese version of the instrument for the assessment of quality of life of the World Health Organization (WHOQOL-100)’ Revista de Saude Publica 33 198–205

    Google Scholar 

  • M. P. Fleck S. Louzada M. Xavier E. Chachamovich G. Vieira L. Santos V. Pinzon (2000) ArticleTitle‘Application of the Portuguese version of the abbreviated instrument of quality life WHOQOL-bref’ Revista de Saude Publica 34 178–183

    Google Scholar 

  • B. Gandek J. E. Ware SuffixJr (1998) ArticleTitle‘Methods for validating and norming translations of health status questionnaires: the IQOLA Project approach. International Quality of Life Assessment’ Journal of Clinical Epidemiology 51 953–959 Occurrence Handle10.1016/S0895-4356(98)00086-9

    Article  Google Scholar 

  • InstitutionalAuthorNameGraphPad (2000) InStat GraphPad Software San Diego

    Google Scholar 

  • F. Guillemin C. Bombardier D. Beaton (1993) ArticleTitle‘Cross-cultural adaptation of health-related quality of life measures: literature review and proposed guidelines’ Journal of Clinical Epidemiology 46 1417–1432 Occurrence Handle10.1016/0895-4356(93)90142-N

    Article  Google Scholar 

  • C. I. Hasanah L. Naing A. R. Rahman (2003) ArticleTitle‘World Health Organization Quality of Life Assessment: brief version in Bahasa Malaysia’ Medical Journal of Malaysia 58 79–88

    Google Scholar 

  • G. Hawthorne R. Osborne (2005) ArticleTitle‘Population norms and meaningful differences for the Assessment of Quality of Life (AQoL) measure’ Australian and New Zealand Journal of Public Health 29 136–142

    Google Scholar 

  • G. Hawthorne J. Richardson (2001) ArticleTitle‘Measuring the value of program outcomes: a review of utility measures’ Expert Review of Pharmacoeconomics Outcomes Research 1 215–228 Occurrence Handle10.1586/14737167.1.2.215

    Article  Google Scholar 

  • G. Hawthorne J. Richardson N. Day (2001a) ArticleTitle‘A comparison of five multi-attribute utility instruments’ Australian Studies in Health Service Administration 89 151–179

    Google Scholar 

  • G. Hawthorne J. Richardson N. A. Day (2001b) ArticleTitle‘A comparison of the Assessment of Quality of Life (AQoL) with four other generic utility instruments’ Annals of Medicine 33 358–370

    Google Scholar 

  • G. Hawthorne J. Richardson R. Osborne (1999) ArticleTitle‘The Assessment of Quality of Life (AQoL) instrument: a psychometric measure of health related quality of life’ Quality of Life Research 8 209–224 Occurrence Handle10.1023/A:1008815005736

    Article  Google Scholar 

  • A.H. Heald S. Ghosh S. Bray C. Gibson S.G. Anderson H. Buckler H.L. Fowler (2004) ArticleTitle‘Long-term negative impact on quality of life in patients with successfully treated Cushing's disease’ Clinical Endocrinology 61 458–465 Occurrence Handle10.1111/j.1365-2265.2004.02118.x

    Article  Google Scholar 

  • H. Herrman G. Hawthorne R. Thomas (2002) ArticleTitle‘Quality of life assessment in people living with psychosis’ Social Psychiatry and Psychiatric Epidemiology 37 510–518 Occurrence Handle10.1007/s00127-002-0587-y

    Article  Google Scholar 

  • I Hinterseher H.D. Saeger R. Koch A. Bloomenthal D. Ockert H. Bergert (2004) ArticleTitle‘Quality of life and long-term results after ruptured abdominal aortic aneurysm’ European Journal of Vascular and Endovascular Surgery 28 262–269 Occurrence Handle10.1016/j.ejvs.2004.06.006

    Article  Google Scholar 

  • C. Hsu J. D. Wang J. S. Hwang H. F. Tien S. M. Chang A. L. Cheng Y. C. Chen J. L. Tang (2003) ArticleTitle‘Survival-weighted health profile for long-term survivors of acute myelogenous leukemia’ Quality of Life Research, 12 503–517 Occurrence Handle10.1023/A:1025043113819

    Article  Google Scholar 

  • H. F. Hwang W. M. Liang Y. N. Chiu M. R. Lin (2003) ArticleTitle‘Suitability of the WHOQOL-BREF for community-dwelling older people in Taiwan’ Age Ageing 32 593–600 Occurrence Handle10.1093/ageing/afg102

    Article  Google Scholar 

  • Y. Jang C. L. Hsieh Y. H. Wang Y. H. Wu (2004) ArticleTitle‘A validity study of the WHOQOL-BREF assessment in persons with traumatic spinal cord injury’ Archives of Physical Medicine and Rehabilitation 85 1890–1895 Occurrence Handle10.1016/j.apmr.2004.02.032

    Article  Google Scholar 

  • D. Kahneman E. Diener N. Schwarz (Eds) (1999) Well-being: The Foundations of Hedonistic Psychology Russell Sage Foundation New York

    Google Scholar 

  • S. Khanna H. Pal R. M. Pandey R. Handa (2004) ArticleTitle‘The relationship between disease activity and quality of life in systemic lupus erythematosus’ Rheumatology (Oxford) 43 1536–1540 Occurrence Handle10.1093/rheumatology/keh376

    Article  Google Scholar 

  • M. R. Lin W. Huang C. Huang H. F. Hwang L. W. Tsai Y. N. Chiu (2002) ArticleTitle‘The impact of the Chi-Chi earthquake on quality of life among elderly survivors in Taiwan–a before and after study’ Quality of Life Research 11 379–388 Occurrence Handle10.1023/A:1015543113448

    Article  Google Scholar 

  • F. W. Lung Y. L. Huang B. C. Shu F. Y. Lee (2004) ArticleTitle‘Parental rearing style, premorbid personality, mental health, and quality of life in chronic regional pain: a causal analysis’ Comprehensive Psychiatry 45 206–212 Occurrence Handle10.1016/j.comppsych.2004.02.009

    Article  Google Scholar 

  • S. K. Min K. I. Kim C. I. Lee Y. C. Jung S. Y. Suh D. K. Kim (2002) ArticleTitle‘Development of the Korean versions of WHO Quality of Life scale and WHOQOL-BREF’ Quality of Life Research 11 593–600 Occurrence Handle10.1023/A:1016351406336

    Article  Google Scholar 

  • M. Mooney F. Hannon M. Barry S. Friel C. Kelleher (2002) ArticleTitle‘Perceived quality of life and mental health status of Irish female prisoners’ Irish Medical Journal 95 241–243

    Google Scholar 

  • K. Muller R. Schwesig S. Leuchte D. Riede (2001) ArticleTitle‘Coordinative treatment and quality of life – a randomised trial of nurses with back pain’ Gesundheitswesen 63 609–618 Occurrence Handle10.1055/s-2001-17872

    Article  Google Scholar 

  • V. J. Naumann G. J. A. Byrne (2004) ArticleTitle‘WHOQoL-Bref as a measure of quality of life in older patients with depression’ International Psychogeriatrics 16 159–173 Occurrence Handle10.1017/S1041610204000109

    Article  Google Scholar 

  • C. B. Nelson M. Lotfy (1999) The World Health Organization’s WHOQOL-BRÈF Quality of Life Assessment: Psychometric Properties and Results of the International Field Trial World Health Organization Geneva

    Google Scholar 

  • V. Noerholm M. Groenvold T. Watt J. B. Bjorner N. A. Rasmussen P. Bech (2004) ArticleTitle‘Quality of life in the Danish general population–normative data and validity of WHOQOL-BREF using Rasch and item response theory models’ Quality of Life Research 13 531–540 Occurrence Handle10.1023/B:QURE.0000018485.05372.d6

    Article  Google Scholar 

  • V. Norholm P. Bech (2001) ArticleTitle‘The WHO Quality of Life (WHOQOL) Questionnaire: Danish validation study’ Nordic Journal of Psychiatry 55 229–235 Occurrence Handle10.1080/080394801681019075

    Article  Google Scholar 

  • R. E. O’Carroll K. Smith M. Couston J. A. Cossar P. C. Hayes (2000) ArticleTitle‘A comparison of the WHOQOL-100 and the WHOQOL-BREF in detecting change in quality of life following liver transplantation’ Quality of Life Research 9 121–124 Occurrence Handle10.1023/A:1008901320492

    Article  Google Scholar 

  • Power, M., K. Quinn, S. Schmidt, and WHOQOL Group: 2005, ‘Development of the WHOQOL-OLD module’. Quality of Life Research 14, 2197–2214

  • N. Sartorius W. Kuyken (1994) ‘Translation of health status instruments’ K Orley W. Kuyken (Eds) Quality of Life Assessment: International Perspectives Springer-Verlag Berlin

    Google Scholar 

  • S. Saxena K. Chandiramani R. Bhargava (1998) ArticleTitle‘WHOQOL-Hindi: a questionnaire for assessing quality of life in health care settings in India. World Health Organization Quality of Life’ National Medical Journal of India 11 160–165

    Google Scholar 

  • K. Sim R. Mahendran S. G. Siris S. Heckers S. A. Chong (2004) ArticleTitle‘Subjective quality of life in first episode schizophrenia spectrum disorders with comorbid depression’ Psychiatry Research 129 141–147 Occurrence Handle10.1016/j.psychres.2004.07.007

    Article  Google Scholar 

  • S. M. Skevington M. Lotfy K. A. O’Connell (2004) ArticleTitle‘The World Health Organization’s WHOQOL-BREF quality of life assessment: psychometric properties and results of the international field trial. A report from the WHOQOL group’ Quality of Life Research 13 299–310 Occurrence Handle10.1023/B:QURE.0000018486.91360.00

    Article  Google Scholar 

  • InstitutionalAuthorNameSPSS, (2003) SPSS for Windows, Version 11.5 SPSS Inc Chicago

    Google Scholar 

  • Szabo, S. and WHOQOL Group: 1996, `The World Health Organization quality of life (WHOQOL) assessment instrument’, in A. Spilker (ed.), Quality of Life and Pharmaco-economics in Clinical Trials (Lippincott-Raven Publishers. Philadelphia), pp. 355–362

  • W. J. Taylor J. Myers R. T. Simpson K. M. McPherson M. Weatherall (2004) ArticleTitle‘Quality of life of people with rheumatoid arthritis as measured by the World Health Organization Quality of Life Instrument, short form (WHOQOL-BREF): score distributions and psychometric properties’ Arthritis and Rheumatism 51 350–357 Occurrence Handle10.1002/art.20398

    Article  Google Scholar 

  • D. S. Tzeng F. W. Lung Y. Y. Chang (2004) ArticleTitle‘Comparison of quality of life for people with schizophrenia and mental health of caregivers between common-based and hospital-based services’ Kaohsiung Journal of Medical Science 20 443–451 Occurrence Handle10.1016/S1607-551X(09)70183-4

    Article  Google Scholar 

  • R. Umansky M. Amir M. Fridmann E. Zidon D. Chen B. Hemetz (2003) ArticleTitle‘Was it a good move? Improvement in quality of life among chronic mental patients moving from a mental hospital to a hostel in the community’ Israel Journal of Psychiatry and Related Sciences 40 248–257

    Google Scholar 

  • X. Wang L. Gao H. Zhang C. Zhao Y. Shen N. Shinfuku (2000) ArticleTitle‘Post-earthquake quality of life and psychological well-being: longitudinal evaluation in a rural community sample in northern China’ Psychiatry and Clinical Neurosciences 54 427–433 Occurrence Handle10.1046/j.1440-1819.2000.00732.x

    Article  Google Scholar 

  • J. Ware B. Gandek S. Keller (1996) ‘Evaluating instruments used cross-nationally: methods from the IQOLA project’ B. Spilker (Eds) Quality of Life and Pharmacoeconomics Lippincott-Raven Publishers Philadelphia 681–692

    Google Scholar 

  • J. Ware M. Kosinski S. Keller (1995) SF-12: How to Score the SF-12 Physical and Mental Health Summary Scales The Health Institute, New England Medical Center Boston

    Google Scholar 

  • J. E. Ware K. K. Snow M. Kosinski B. Gandek (1993) SF-36 Health Survey: Manual and Interpretation Guide The Health Institute, New England Medical Centre Boston

    Google Scholar 

  • InstitutionalAuthorNameWHO (1993) Measuring Quality of Life: The Development of the World Health Organization Quality of Life Instrument (WHOQOL) Division of Mental Health, World Health Organization Geneva 9

    Google Scholar 

  • InstitutionalAuthorNameWHOQoL Group. (1993) ArticleTitle‘Study protocol for the World Health Organization project to develop a quality of life assessment instrument (WHOQOL)’ Quality of Life Research 2 153–159 Occurrence Handle10.1007/BF00435734

    Article  Google Scholar 

  • InstitutionalAuthorNameWHOQoL Group (1994a) ArticleTitle‘Development of the WHOQOL: rationale and current status’ International Journal of Mental Health 23 24–56

    Google Scholar 

  • InstitutionalAuthorNameWHOQoL Group (1994b) ‘The development of the World Health Organization quality of life assessment instrument (the WHOQOL)’ J. Orley W. Kuyken (Eds) Quality of Life Assessment International Perspectives Springer-Verlag Berlin 41–60

    Google Scholar 

  • InstitutionalAuthorNameWHOQoL Group. (1995) ArticleTitle‘The World Health Organization Quality of Life Assessment (WHOQOL): position paper from the World Health Organization’ Social Science and Medicine 41 1403–1409 Occurrence Handle10.1016/0277-9536(95)00112-K

    Article  Google Scholar 

  • InstitutionalAuthorNameWHOQoL Group. (1998a) ArticleTitle‘Development of the World Health Organization WHOQOL-BREF Quality of Life Assessment’ Psychological Medicine 28 551–558 Occurrence Handle10.1017/S0033291798006667

    Article  Google Scholar 

  • InstitutionalAuthorNameWHOQoL Group. (1998b) ArticleTitle‘The World Health Organization Quality of Life Assessment (WHOQOL): development and general psychometric properties’ Social Science and Medicine 46 1569–1585 Occurrence Handle10.1016/S0277-9536(98)00009-4

    Article  Google Scholar 

  • J. Wray S. Al-Ruzzeh W. Mazrani K. Nakamura S. George C. Ilsley M. Amrani (2004) ArticleTitle‘Quality of life and coping following minimally invasive direct coronary artery bypass (MIDCAB) surgery’ Quality of Life Research 13 915–924 Occurrence Handle10.1023/B:QURE.0000025600.56517.c5

    Article  Google Scholar 

  • S. Yao C.W. Chung C.F. Yu J. D. Wang (2002) ArticleTitle‘Development and verification of validity and reliability of the WHOQOL-BREF Taiwan version’ Journal of the Formosan Medical Association 101 342–351

    Google Scholar 

  • C. F. Yen J. J. Tsai P. L. Lu Y. H. Chen T. C. Chen P. P. Chen T. P. Chen (2004) ArticleTitle‘Quality of life and its correlates in HIV/AIDS male outpatients receiving highly active antiretroviral therapy in Taiwan’ Psychiatry and Clinical Neurosciences 58 501–506 Occurrence Handle10.1111/j.1440-1819.2004.01292.x

    Article  Google Scholar 

  • C. L. Yu R. Fielding C. L. Chan V. K. Tse P. H. Choi W. H. Lau D. T. Choy S. K. Lee O A. W. J. S. Sham (2000) ArticleTitle‘Measuring quality of life of Chinese cancer patients: a validation of the Chinese version of the Functional Assessment of Cancer Therapy-General (FACT-G) scale’ Cancer 88 1715–1727 Occurrence Handle10.1002/(SICI)1097-0142(20000401)88:7<1715::AID-CNCR28>3.0.CO;2-K

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Graeme Hawthorne.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Hawthorne, G., Herrman, H. & Murphy, B. Interpreting the WHOQOL-Brèf: Preliminary Population Norms and Effect Sizes. Soc Indic Res 77, 37–59 (2006). https://doi.org/10.1007/s11205-005-5552-1

Download citation

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11205-005-5552-1

Keywords

Navigation