Stigma In Global Context: Mental Health Study
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Spain Sample Design

STUDY DESCRIPTION

 Study design:                        Research, questionnaire and sample: ASEP.

 Sample type:                        1,202 people of both sexes, aged 18 years old and over, living in private households in Spain . Sample stratified by Autonomous Regions and Municipalities, using the random route system and final selection of respondents by sex and age quotas.

 Fieldwork methods:              Fieldwork was carried out from the 16th to the 21st of February 2004 . Face to face interview at respondent’s home. The fieldwork was supervised by ASEP.

 Data processing:                   Designed and conducted by ASEP with its own software, elaborated by JD Systems.

 Analysis and report:              Designed and carried out by  ASEP, and finished on the 5th of March 2004 .

 GENERAL CHARACTERISTICS

 ·         Universe:  Individuals of both sexes, 18 years old and over.

·         Scope: National = Mainland, and the Islands (Baleares and Canarias).  

·         Sampling spots: 133 Municipalities.  

·         Number of routes: 155.  

·         Type of interview: At respondent’s home.  

·         Sampling bias: ± 2.88 at most.  

SAMPLE  

·         Sample stratification: The selection criteria was that of proportional distribution of interviews according to population in each of the 17 Autonomous Regions and according to community size.  

Those municipalities with more than 500,000 inhabitants are of compulsory selection; the rest come out from a random draw.  

The same number of interviews per Autonomous Region is kept in each study. The only Autonomous Regions that always have interviews at all levels of community size are: Andalucía, Cataluña and País Valenciano. The strata of the other regions are drawn each month.  

The  number of interviews that proportionally corresponds to each province and type of community is also taken into consideration within each Autonomous Region. Moreover, we keep track of the population settlements  that are selected so that they are not repeated, and in large cities we distribute the interviews among the districts.  

·         Household selection: once the number of interviews to be done has been established (by size of community and Autonomous Region), we use a computerised system to randomly extract municipalities and electoral sections within them. The number of electoral sections randomly selected is related to the total number of interviews to carry out in the municipality.  

A random route system is applied for household selection; in all the buildings that the interviewer passes by (on either side of the street, depending on the side where the starting point is), one every three housings is selected; in case of refusal or non-contact, the interviewer goes to the next household.  

·         Respondents’ selection: age and sex quotas are used for the respondent’s selection. These quotas are established in each sampling point according to cross tabulation between size of community and age and sex at national level and also at regional level in the three regions above mentioned (Cataluña, Andalucía, País Valenciano). In the other regions the distribution is proportional.  

·         Achieved sample: the distribution of the 1,217 interviews of this study (1,202 = achieved sample) is shown on the next table. The figure on the left in each cell corresponds to the desired sample and the figure on the right corresponds to the achieved sample.

 DATA QUALITY  

·         Training for interviewers: Personal training for the interviewers was conducted  in Madrid . The training was carried out by telephone for the area co-ordinators, and the co-ordinators were in charge of training their respective interviewers. This training was done between the 13th and 16th of February.  

·         Fieldwork check-up:  

-          100% of the questionnaires were cleansed.  

-          Telephone supervision of 280 interviews (23%), ASEP.  

-          15 questionnaires were cancelled as results of the cleansing/ supervision work.

 

 

 

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Last updated: 6 September 2005
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