Table 1.
World Mental Health sample characteristics
| Sample size, n |
||||||||
|---|---|---|---|---|---|---|---|---|
| Country | Survey | Sample characteristicsa | Field dates | Age range years | Part 1 | Part 2 | Part 2 and age ≤ 44b | Response ratec |
| Brazil
|
São Paulo megacity
|
Stratified multistage clustered area probability sample of household residents
in the São Paulo metropolitan area.
|
2005-7
|
18+
|
5037
|
2942
|
—
|
81.3
|
| Bulgaria
|
NSHS
|
Stratified multistage clustered area probability sample of household
residents. NR.
|
2003-7
|
18+
|
5318
|
2233
|
741
|
72.0
|
| Colombia
|
NSMH
|
Stratified multistage clustered area probability sample of household residents
in all urban areas of the country (approximately 73% of the total national
population)
|
2003
|
18-65
|
4426
|
2381
|
1731
|
87.7
|
| India
|
WMHI
|
Stratified multistage clustered area probability sample of household residents
in Pondicherry region. NR
|
2003-5
|
18+
|
2992
|
1373
|
642
|
98.8
|
| Japan
|
WMHJ20 02-2006
|
Un-clustered two-stage probability sample of individuals residing in
households in nine metropolitan areas (Fukiage, Higashi-ichiki, Ichiki,
Kushikino, Nagasaki, Okayama, Sano, Tamano, and Tendo)
|
2002-6
|
20+
|
3417
|
1305
|
425
|
59.2
|
| Lebanon
|
LEBANON
|
Stratified multistage clustered area probability sample of household
residents. NR.
|
2002-3
|
18+
|
2857
|
1031
|
595
|
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
|
1736
|
76.6
|
| New Zealandd |
NZMHS
|
Stratified multistage clustered area probability sample of household
residents. NR.
|
2004-5
|
18+
|
12 790
|
7312
|
4119
|
73.3
|
| Romania
|
RMHS
|
Stratified multistage clustered area probability sample of household
residents. NR.
|
2005-6
|
18+
|
2357
|
2357
|
—
|
70.9
|
| USA | NCS-R | Stratified multistage clustered area probability sample of household residents. NR. | 2002-3 | 18+ | 9282 | 5692 | 3197 | 70.9 |
NSHS, Bulgaria National Survey of Health and Stress; NR, nationally representative; NSMH, The Colombian National Study of Mental Health; WMHI, World Mental Health India; WMHJ2002-2006, World Mental Health Japan Survey; LEBANON, Lebanese Evaluation of the Burden of Ailments and Needs of the Nation; M-NCS, The Mexico National Comorbidity Survey; NZMHS (New Zealand Mental Health Survey; RMHS, Romania Mental Health Survey; NCS-R, The US National Comorbidity Survey Replication.
a. Most World Mental Health surveys are based on stratified multistage clustered area probability household samples in which samples of areas equivalent to counties or municipalities in the USA were selected in the first stage followed by one or more subsequent stages of geographic sampling (e.g. towns within counties, blocks within towns, 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. The Japanese sample is the only totally unclustered sample, with households randomly selected in each of the four sample areas and one random respondent selected in each sample household. Six of the ten surveys are based on NR household samples, whereas two others are based on NR household samples in urbanised areas (Colombia, Mexico).
b. Brazil, New Zealand and Romania did not have an age restricted part 2 sample. All other countries, with the exception of India (which was age restricted to 39), were age restricted to 44 years.
c. 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 74.4%.
d. New Zealand interviewed respondents 16+ but for the purposes of cross-national comparisons we limited the sample to those 18+.