The age range of the survey has changed over the years.
In 1995, only adults aged 16-64 were interviewed.
In 1998, adults aged 16-74 and children aged 2-15 were interviewed.
From 2003 onwards, adults aged 16+ and children aged 0-15 were interviewed.
The sample sizes achieved for each year are as follows:
|Year||Child||Adult (main)||Adult (HB boost)||Adult (total)|
From 2015-2016 the survey has been designed to produce an achieved sample size of around 4,000 adults and 1,800 children per year.
Health Board Boosts
From 2008, Health Boards were given the option to boost their samples beyond the level which was funded centrally at the outset of the survey. In 2008 and 2009, three Health Boards took this opportunity - Borders, Fife and Grampian. Each boosted their sample by an additional 200 adults. In 2010 and 2011, Fife and Grampian continued to boost by 200 adults per year. Boosted interviews only comprise core questions, no module questions are asked.
In 2012, three boards boosted their adult samples by 300 interviews - Fife, Grampian and Dumfries & Galloway. In 2013, four boards boosted - Fife and Grampian by 300 interviews and Ayrshire & Arran and Western Isles by 200 interviews. In 2014, Ayrshire and Arran, Fife, and Grampian boosted by 300, Western Isles by 100.