Table 1.
Country by income category | Surveyb | Sample characteristicsc | Field dates | Age range | Sample size
|
Response rated | |
---|---|---|---|---|---|---|---|
Part 1 | Part 2 | ||||||
I. Low- and lower-middle-income countries | |||||||
Colombia | NSMH | All urban areas of the country (approximately 73% of the total national population). | 2003 | 18–65 | 4426 | 2381 | 87.7 |
India | WMHI | Pondicherry region. | 2003–5 | 18–97 | 2992 | 1373 | 98.8 |
Nigeria | NSMHW | Twenty-one of the 36 states in the country, representing 57% of the national population. The surveys were conducted in Yoruba, Igbo, Hausa and Efik languages. | 2002–3 | 18–100 | 6752 | 2143 | 79.3 |
PRC | B-WMH | Beijing and Shanghai metropolitan areas. | 2002–3 | 18–70 | 5201 | 1628 | 74.7 |
Ukraine | S-WMH CMDPSD |
Nationally representative. | 2002 | 18–91 | 4724 | 1720 | 78.3 |
Total | 24 095 | 9245 | |||||
II. Upper-middle-income countries | |||||||
Brazil | São Paulo Megacity | Stratified multistage clustered area probability sample of household residents in the São Paulo metropolitan area. | 2005–7 | 18–93 | 5037 | 2942 | 81.3 |
Bulgaria | NSHS | Nationally representative. | 2003–7 | 18–98 | 5318 | 2233 | 72.0 |
Lebanon | LEBANON | Nationally representative. | 2002–3 | 18–94 | 2857 | 1031 | 70.0 |
Mexico | M-NCS | Stratified multistage clustered area probability sample of household residents in all urban areas of the country (approximately 75% of the total national population). | 2001–2 | 18–65 | 5782 | 2362 | 76.6 |
Romania | RMHS | Nationally representative. | 2005–6 | 18–96 | 2357 | 2357 | 70.9 |
South Africae | SASH | Nationally representative. | 2003–4 | 18–92 | 4315 | 4315 | 87.1 |
Total | 25 666 | 15 240 | |||||
III. High-income countries | |||||||
Belgium | ESEMeD | Nationally representative. The sample was selected from a national register of Belgium residents. | 2001–2 | 18–95 | 2419 | 1043 | 50.6 |
France | ESEMeD | Nationally representative. The sample was selected from a national list of households with listed telephone numbers. | 2001–2 | 18–97 | 2894 | 1436 | 45.9 |
Germany | ESEMeD | Nationally representative. | 2002–3 | 18–95 | 3555 | 1323 | 57.8 |
Israel | NHS | Nationally representative. | 2002–4 | 21–98 | 4859 | 4859 | 72.6 |
Italy | ESEMeD | Nationally representative. The sample was selected from municipality resident registries. | 2001–2 | 18–100 | 4712 | 1779 | 71.3 |
Japan | WMHJ 2002–2006 | Eleven metropolitan areas. Although samples from a clustered household sample, there was no within-household clustering due to setting the sampling fraction so that some households were skipped after enumeration because residents fall below the specified sampling fraction | 2002–6 | 20–98 | 4129 | 1682 | 55.1 |
Netherlands | ESEMeD | Nationally representative. The sample was selected from municipal postal registries. | 2002–3 | 18–95 | 2372 | 1094 | 56.4 |
New Zealande | NZMHS | Nationally representative. | 2003–4 | 18–98 | 12 790 | 7312 | 73.3 |
Northern Ireland | NISHS | Nationally representative. | 2004–7 | 18–97 | 4340 | 1986 | 68.4 |
Portugal | NMHS | Nationally representative. | 2008–9 | 18–81 | 3849 | 2060 | 57.3 |
Spain | ESEMeD | Nationally representative. | 2001–2 | 18–98 | 5473 | 2121 | 78.6 |
United States | NCS-R | Nationally representative. | 2002–3 | 18–99 | 9281 | 5692 | 70.9 |
Total | 60 673 | 32 387 | |||||
IV. Total | 110 434 | 56 872 | 70.8 |
NSMH (The Colombian National Study of Mental Health), WMHI (World Mental Health India), NSMHW (The Nigerian Survey of Mental Health and Wellbeing), B-WMH (The Beijing World Mental Health Survey), S-WMH (The Shanghai World Mental Health Survey), CMDPSD (Comorbid Mental Disorders during Periods of Social Disruption), NSHS (Bulgaria National Survey of Health and Stress), LEBANON (Lebanese Evaluation of the Burden of Ailments and Needs of the Nation), M-NCS (The Mexico National Comorbidity Survey), RMHS (Romania Mental Health Survey), SASH (South Africa Health Survey), ESEMeD (The European Study Of The Epidemiology Of Mental Disorders), NHS (Israel National Health Survey), WMHJ 2002–2006 (World Mental Health Japan Survey), NZMHS (New Zealand Mental Health Survey), NISHS (Northern Ireland Study of Health and Stress), NMHS (Portugal National Mental Health Survey), NCS-R (The US National Comorbidity Survey Replication).
Most WMH surveys are based on stratified multistage clustered area probability household samples in which samples of areas equivalent to counties or municipalities in the US were selected in the first stage followed by one or more subsequent stages of geographic sampling (e.g. towns within counties, blocks within towns, and households within blocks) to arrive at a sample of households, in each of which a listing of household members was created and one or two people were selected from this listing to be interviewed. No substitution was allowed when the originally sampled household resident could not be interviewed. These household samples were selected from Census area data in all countries other than France (where telephone directories were used to select households) and the Netherlands (where postal registries were used to select households). Several WMH surveys (Belgium, Germany, and Italy) used municipal resident registries to select respondents without listing households. The Japanese sample is the only totally un-clustered sample, with households randomly selected in each of the four sample areas and one random respondent selected in each sample household. Sixteen of the 23 surveys are based on nationally representative (NR) household samples.
The response rate is calculated as the ratio of the number of households in which an interview was completed to the number of households originally sampled, excluding from the denominator households known not to be eligible either because of being vacant at the time of initial contact or because the residents were unable to speak the designated languages of the survey. The weighted average response rate is 70.8%.
South Africa and New Zealand interviewed respondents 16+ but for the purposes of cross-national comparisons we limit the sample to those 18 + .