Abbreviated Name:
Tobacco use among persons (13-15 years)
Indicator Name:
Age standardized prevalence of current tobacco use among persons aged 13-15 years
Domain:
Health determinants and risks / Risk factors
Related Terms:
Non-communicable diseases, risk factors
Definition:
The youth prevalence rate, expressed as a percentage of the total youth population aged 13 - 15, refers to the number of current users of any tobacco product per 100 of the youth population (aged 13 - 15). When this prevalence rate is multiplied by the youth population (aged 13 - 15), the result is an estimate of the number of current users of any tobacco product aged 13 - 15 in the country. Current users of any tobacco product are defined as those that consumed any smokeless or smoking tobacco product at least once during the last 30 days prior to the survey.
Measurment Method:
(Number of respondents aged 13-15 years currently using any tobacco product) / (Number of surveyed respondents aged 13-18 years) x 100
Numerator:
Number of current youth smokers (daily or less than daily) of any tobacco product in the population surveyed
Denominator
Total size of surveyed population aged 13-18 years (youth smokers and non-smokers)
Estimation method:
A statistical model based on a Bayesian negative binomial meta-regression is used to model prevalence of current tobacco smoking for each country,
separately for men and women. A full description of the method is available as a peer-reviewed article in The Lancet, volume 385, No. 9972,
p966–976 (2015). Once the age-and-sex-specific prevalence rates from national surveys are compiled into a dataset, the model is fitted to calculate
trend estimates from the year 2000 to 2030. The model has two main components: (a) adjusting for missing indicators and age groups, and (b)
generating an estimate of trends over time as well as the 95% credible interval around the estimate. Depending on the completeness of survey
data from a particular country, the model at times makes use of data from other countries to fill information gaps. To fill data gaps, information is
“borrowed” from countries in the same UN subregion. The resulting trend lines are used to derive estimates for single years, so that a number can be
reported even if the country did not run a survey in that year. In order to make the results comparable between countries, the prevalence rates are
age-standardized to the WHO Standard Population
separately for men and women. A full description of the method is available as a peer-reviewed article in The Lancet, volume 385, No. 9972,
p966–976 (2015). Once the age-and-sex-specific prevalence rates from national surveys are compiled into a dataset, the model is fitted to calculate
trend estimates from the year 2000 to 2030. The model has two main components: (a) adjusting for missing indicators and age groups, and (b)
generating an estimate of trends over time as well as the 95% credible interval around the estimate. Depending on the completeness of survey
data from a particular country, the model at times makes use of data from other countries to fill information gaps. To fill data gaps, information is
“borrowed” from countries in the same UN subregion. The resulting trend lines are used to derive estimates for single years, so that a number can be
reported even if the country did not run a survey in that year. In order to make the results comparable between countries, the prevalence rates are
age-standardized to the WHO Standard Population
Disaggregation:
Wherever possible, prevalence data should be separated for boys and girls, and combined (total) prevalence should also be provided.
Primary data sources:
National surveys implemented as part of international data collection initiatives, such as - Tobacco-specific surveys: Global Youth Tobacco Survey (GYTS); - Non-tobacco-specific surveys: Global School-based Student Health Survey (GSHS). - Specific population surveys
Alternate data sources:
These include: national specific population surveys conducted by the country’s national surveillance system, national statistical office, or any other relevant agency/ministries, or by research groups (and include academic research or studies implemented by nongovernmental organizations). If no national data are available, country estimates may be found in the WHO Global Health Observatory Data Repository.
Measurment frequency:
At least once every five years.
