Working conditions and quality of life in Spanish workplaces
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Annex: Methodology
It should be noted that the methodology of the Sixth National Survey on Working Conditions has been modified compared to previous survey editions. Until 2004, the overall study consisted of two different surveys, one of which was carried out among employers and the other one among workers. Both surveys were conducted in the workplace. However, according to the new methodology, data are collected only among workers and interviews take place in the worker’s home.
The main methodological aspects of the Sixth National Survey on Working Conditions are set out in Table 1.
| Survey name | Sixth National Survey on Working Conditions (VI Encuesta Nacional de Condiciones de Trabajo) |
|---|---|
| Organisation in charge | Spanish National Institute of Safety and Hygiene in the Workplace (Instituto Nacional de Seguridad e Higiene en el Trabajo, INSHT), a subsidiary body of the Spanish Ministry of Labour and Immigration (Ministerio de Trabajo e Inmigración, MTIN) |
| Frequency | This is the sixth issue of the working conditions survey. The frequency of this survey has varied, with the first one having been carried out more than 20 years ago and the following issues being published in 1983, 1987, 1993, 1997, 1999 and 2004. |
| Geographic coverage | The survey covers the entire country, with the exception of the Spanish territories in northern Africa, Ceuta and Melilla. |
| Surveyed population | Working population, both employees and self-employed workers across all sectors of economic activity. |
| Sample | 11,054 interviews were carried out. The sampling strategy is based on economic sector, company size and regional quotas. Sampling error /-0.95%, at 95.5% confidence level, with p=q=50%. |
| Interviews | Face-to-face interviews at the interviewees’ home. |
| Date of fieldwork | Between 12 December 2006 and 11 April 2007. |
Source: INSHT, 2007
The main methodological aspects of the 2007 survey on Quality of Life in the Workplace are outlined in Table 2.
| Survey name | Quality of Life in the Workplace (Encuesta de Calidad de Vida en el Trabajo) |
|---|---|
| Organisation in charge | Spanish Ministry of Labour and Immigration (Ministerio de Trabajo e Inmigración, MTIN) |
| Frequency | Annual survey, with a first edition in 1999 and the last edition in 2007. The survey was not carried out in 2005. |
| Geographic coverage | The survey covers the entire country, with the exception of the Spanish territories in northern Africa, Ceuta and Melilla. |
| Surveyed population | Working population (aged 16 years or older), both employees and self-employed workers. |
| Sample | 8,974 working persons. Sampling strategy is based on regional quotas. |
| Interviews | The interviews are carried out by phone, using the Computer-Assisted Telephone Interview (CATI) system. Interviews are only carried out in person, using the Computer-Assisted Personal Interview (CAPI) system, if it is impossible to contact the interviewees by phone. |
| Date of fieldwork | Last quarter of 2007. |
Source: MTIN, 2007.
Jessica Duran and Antonio Corral, IKEI
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