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Table 1 Description of the surveys conducted at each site.

From: Cross-national differences in clinically significant cannabis problems: epidemiologic evidence from 'cannabis-only' smokers in the United States, Mexico, and Colombia

Country

Survey

Sample characteristics*

Dates

Age

Sample size

Response rate, %**

     

Part1

Part2

 

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

4,426

2,381

88

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).

2001-2002

18-65

5,782

2,362

77

USA

NCS-R

Stratified multistage clustered area probability sample of household residents, nationally representative.

2002-2003

≥18

9,282

5,692

71

USA

NLAAS

(Latino sample)

Stratified multistage clustered area probability sample of household residents, nationally representative of Latino population with special supplements of Puerto Rican and Cuban people.

2002-2003

≥18

2,554

348

76

  1. Abbreviations: NSMH, the Colombian National Study of Mental Health; M-NCS, the Mexico National Comorbidity Survey; NCS-R, the US National Comorbidity Survey Replication; NLAAS, the National Latino and Asian American Study of Mental Health.
  2. *Most World Mental Health surveys are based on stratified multistage clustered area probability household samples in which samples of areas equivalent to municipalities or counties in the United States were selected in the first stage followed by 1 or more subsequent stages of geographic sampling (eg, 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 1 or 2 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. United States surveys are based on nationally representative household samples, while Colombia and Mexico are based on nationally representative household samples in urbanized areas.
  3. **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.
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BMC Public Health

ISSN: 1471-2458

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