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. Author manuscript; available in PMC: 2017 Mar 2.
Published in final edited form as: JAMA Psychiatry. 2016 Feb;73(2):150–158. doi: 10.1001/jamapsychiatry.2015.2688

Table 1.

World Mental Health Sample Characteristics by World Bank Income Categoriesa

Income Category Survey Sample Characteristics Field Dates Age
Range, yb 		Sample Size, No. Response
Rate, %
Part 1 Part 2
Low-lower middle
  Colombia NSMH All urban areas of the country
(approximately 73% of the
total national population)		 2003   18–65    4426    2381 87.7
  Iraq IMHS Nationally representative 2006–2007 ≥18    4332    4332 95.2
  Peru EMSMP Nationally representative 2004–2005   18–65    3930    1801 90.2
  Shenzhen, China Shenzhen Shenzhen metropolitan area
Included temporary and
household residents		 2006–2007 ≥18    7132    2475 80.0
Upper middle
  Colombia (Medellin)c MMHHS Medellin metropolitan area 2011–2012   18–65    3261    1673 97.2
  Mexico M-NCS All urban areas
(approximately 75% of the
total national population)		 2001–2002   18–65    5782    2362 76.6
  Romania RMHS Nationally representative 2005–2006 ≥18    2357    2357 70.9
High
  Belgium ESEMeD Nationally representative 2001–2012 ≥18    2419    1043 50.6
  Italy ESEMeD Nationally representative 2001–2012 ≥18    4712    1779 71.3
  Japan WMHJ Eleven metropolitan areas 2002–2006 ≥20    4129    1682 55.1
  New Zealand NZMHS Nationally representative 2003–2004 ≥18 12 790    7312 73.3
  Northern Ireland NIMHS Nationally representative 2004–2007 ≥18    4340    1986 68.4
  Poland EZOP Nationally representative 2010–2011   18–64 10 080    4000 50.4
  Portugal NMHS Nationally representative 2008–2009 ≥18    3849    2060 57.3
  Spain ESEMeD Nationally representative 2001–2002 ≥18    5473    2121 78.6
  Spain(Murcia) PEGASUS-Murcia Murcia region 2010–2012 ≥18    2621    1459 67.4
  The Netherlands ESEMeD Nationally representative 2002–2003 ≥18    2372    1094 56.4
  United States NCS-R Nationally representative 2002–2003 ≥18    9282    5692 70.9
Total 93 287 47 609
Weighted mean response rate, % 69.3

Abbreviations: EMSMP, La Encuesta Mundial de Salud Mental en el Peru; ESEMeD, European Study of the Epidemiology of Mental Disorders; EZOP, Epidemiology of Mental Health and Access to Care Survey; IMHS, Iraq Mental Health Survey; M-NCS, Mexico National Comorbidity Survey; MMHHS, Medellín Mental Health Household Study; NCS-R, National Comorbidity Survey Replication; NIMHS, Northern Ireland Mental Health Survey; NMHS, Portugal National Mental Health Survey; NSMH, National Study of Mental Health; NZMHS, New Zealand Mental Health Survey; PEGASUS, Murcia, Psychiatric Enquiry to General Population in Southeast Spain-Murcia; RMHS, Romania Mental Health Survey; WMHJ World Mental Health Japan.

a

World Bank categorization was used.13

b

For the purposes of cross-national comparisons, we limited the sample to individuals 18 years or older.

c

The newer Colombian survey in Medellin was classified as an upper-middle–income country (owing to a change of classification by the World Bank), although the original survey in Colombia was classified as a low to lower-middle–income country.