European Health Interview Survey
European health interview survey was conducted in 2014, and it was the second survey on this subject conducted in Latvia (the first one was conducted in 2008).
The survey mainly was aimed at acquisition of internationally comparable data, moreover it allowed to collect statistics for self-perceived health status of Latvia population, long-standing illnesses and health problems, life habits, as well as accessibility of health services.
Terms and definitions
Unemployed persons [EHIS]
All persons whether registered with the State Employment Agency or not who during the reference week neither worked nor were temporary absent from work, but had actively sought employment and in case of finding it were available to start work immediately.
Persons who can neither be classified as employed nor as unemployed persons (pupils, students, non–working pensioners, etc.).
Level of education
Basic education or lower: an individual has not acquired school education or the attained education is lower than primary education; has attained primary education; basic education; vocational basic education; vocational education with pedagogical correction; vocational education after basic education.
Secondary education: an individual has acquired general secondary education; general secondary education after vocational education; vocational secondary education after basic education; vocational secondary education after vocational education; vocational education after general secondary education, vocational secondary education after general secondary education.
Higher education: an individual has acquired first level higher education; academic education (bachelor’s degree) or second level vocational higher education (vocational bachelor’s degree); second level vocational higher education (length of studies – 5 years); academic education (master’s degree) or second level vocational higher education (vocational master’s degree); doctorate degree.
One fifth (20%) of the number of surveyed households grouped in increasing sequence according to the disposable income per one household member.
Body mass index (BMI)
Body mass index is an indicator determining underweight, overweight or obesity rate of a person. It is calculated by dividing body weight (in kilograms) by height (in meters) squared. The BMI is classified into categories based on the World Health Organisation subdivision.
Person’s height and weight was self-reported by respondents themselves by answering the following questions: "How tall are you without shoes?" and "How much do you weigh without clothes and shoes?". All the results acquired were broken down into four groups:
- BMI < 18.50 – underweight;
- 18.50 ≤ BMI ≤ 24.99 – normal weight;
- 25.00 ≤ BMI ≤ 29.99 – overweight;
- BMI ≥ 30.00 – obese.
Private household (household)
Several persons living in one dwelling and sharing expenditures or one person having separate housekeeping.
Total net monthly income of a household
Total income of a household, after tax and other deductions.
Monthly income includes also income from work or other economic activity, old-age or disability pensions, benefits (unemployment, sickness, family, childcare, housing, etc.).
Data collection and statistical processing
Survey method and data source
The survey methodology was developed based on the documentation drawn up by the Statistical Office of the European Union (Eurostat) and common questionnaire – European Health Interview Survey (EHIS wave 2). Methodological information used in the survey is available on the Eurostat website.
The field work of the survey was performed from September 2014 to February 2015. The data collection engaged several methods: computer-assisted personal interviewing (CAPI), computer-assisted telephone interviewing (CATI) and computer-assisted web interviewing (CAWI).
The target population of the survey covered usually resident population of the Republic of Latvia that on 1 September 2014 reached the age of 15 and the place of usual residence whereof on this date was located in private housing.
The target population of the survey does not include inhabitants of the Republic of Latvia the usual place of residence whereof on 1 September 2014 was located in old people’s home, home for disabled, student hostel or other collective accommodation facility.
The survey sample was formed as a stratified random sample. The sampling was performed based on a population frame – list of people covering all persons belonging to the target population the most precisely.
The total sample size accounted for 11 340 people.
European Health Interview Survey is a sample survey and the data thereof are extrapolated to the whole target population of the survey. During the data extrapolation or weighting process, the design weights which are corrected based on the share of respondents in the sample are used. The weights are additionally calibrated by gender, age, residence region, residence urbanisation level, highest level of education attained, economic activity status, access to state-funded health care services, size of housing and other features.
The non-response rate weighted based on the sampling scales accounts for 34.8 %.
In the European Health Interview Survey, the following classifications were used:
- International standard Classification of Occupations (ISCO-08);
- Statistical Classification of Economic Activities in the European Community (NACE Rev. 2);
- International Standard Classification of Education (ISCED).
Contact person on methodology
Social Statistics Methodology Section
Social Statistics Department