Methods of the International Tobacco Control (ITC) EUREST-PLUS ITC Europe Surveys
Authors: Thompson Mary E , Driezen Pete , Boudreau Christian , Bécuwe Nicolas , Agar Thomas K , Quah Anne C K , Zatoński Witold , Przewoźniak Krzysztof , Mons Ute , Demjén Tibor , Tountas Yannis , Trofor Antigona , Fernández Esteve , McNeill Ann , Willemsen Marc , Vardavas Constantine , Fong Geoffrey T ,   the EUREST-PLUS consortium, Vardavas Constantine I , Glahn Andrea , Kyriakos Christina N , Nguyen Dominick , Nikitara Katerina , Radu-Loghin Cornel , Starchenko Polina , Tsatsakis Aristidis , Girvalaki Charis , Igoumenaki Chryssi , Papadakis Sophia , Papathanasaki Aikaterini , Tzatzarakis Manolis , Vardavas Alexander I , Bécuwe Nicolas , Deaconu Lavinia , Goudet Sophie , Hanley Christopher , Rivière Oscar , Demjén Tibor , Kiss Judit , Kovacs Anna Piroska , Fernández, Esteve , Castellano Yolanda , Fu Marcela , Nogueira Sarah O , Tigova Olena , McNeill Ann , East Katherine , Hitchman Sara C , Mons Ute , Kahnert Sarah , Tountas Yannis , Behrakis Panagiotis , Filippidis Filippos T , Gratziou Christina , Katsaounou Paraskevi , Peleki Theodosia , Petroulia Ioanna , Tzavara Chara , Trofor Antigona Carmen , Eremia Marius , Lotrean Lucia , Mihaltan Florin , Rohde Gernot , Asano Tamaki , Cichon Claudia , Far Amy , Genton Céline , Jessner Melanie , Hedman Linnea , Janson Christer , Lindberg Ann , Maguire Beth , Ravara Sofia , Vaccaro Valérie , Ward Brian , Willemsen Marc , de Vries Hein , Hummel Karin , Nagelhout Gera E , Zatoński Witold A , Herbeć Aleksandra , Janik-Koncewicz Kinga , Przewoźniak Krzysztof , Zatoński Mateusz , Fong Geoffrey T , Agar Thomas K , Driezen Pete , Gravely Shannon , Quah Anne C K , Thompson Mary E 
Published: February 2020

AbstractBackgroundThe EUREST-PLUS ITC Europe surveys aim to evaluate the impact of the European Union’s Tobacco Products Directive (EU TPD) implementation within the context of the WHO FCTC. This article describes the methodology of the 2016 (Wave 1) and 2018 (Wave 2) International Tobacco Control 6 European (6E) Country Survey in Germany, Greece, Hungary, Poland, Romania and Spain; the England arm of the 2016 (Wave 1) and 2018 (Wave 2) ITC 4 Country Smoking and Vaping (4CV) Survey; and the 2016 (Wave 10) and 2017 (Wave 11) ITC Netherlands (NL) Survey. All three ITC surveys covering a total of eight countries are prospective cohort studies with nationally representative samples of smokers.MethodsIn the three surveys across the eight countries, the recruited respondents were cigarette smokers who smoked at least monthly, and were aged 18 and older. At each survey wave, eligible cohort members from the previous waves were retained, regardless of smoking status, and dropouts were replaced by a replenishment sample.ResultsRetention rates between the two waves of the ITC 6E Survey by country were 70.5% for Germany, 41.3% for Greece, 35.7% for Hungary, 45.6% for Poland, 54.4% for Romania and 71.3% for Spain. The retention rate for England between ITC 4CV1 and ITC 4CV2 was 39.1%; the retention rates for the ITC Netherlands Survey were 76.6% at Wave 10 (2016) and 80.9% at Wave 11 (2017).ConclusionThe ITC sampling design and data collection methods in these three ITC surveys allow analyses to examine prospectively the impact of policy environment changes on the use of cigarettes and other tobacco products in each country, to make comparisons across the eight countries.