Detailed information on the design and operation of the National Health Survey, 2014-15 can be found in the Explanatory Notes of National Health Survey: First Results, 2014-15 (cat. no. 4364.0.55.001) including scope and coverage, survey design, data collection methodology, weighting, benchmarking and estimation, and the reliability of estimates. Information about the comparison of estimates and significance testing can be accessed from the Technical Note page of that publication. Lists of terms and definitions used in the NHS 2014-15 can be found under the Abbreviations and Glossary pages. Published summary tables, the survey questionnaire and prompt cards can be accessed from the Downloads page.