TY - JOUR AU - Koitsalu, Marie AU - Eklund, Martin AU - Adolfsson, Jan AU - Grönberg, Henrik AU - Brandberg, Yvonne PY - 2018 DA - 2018/01/05 TI - Effects of pre-notification, invitation length, questionnaire length and reminder on participation rate: a quasi-randomised controlled trial JO - BMC Medical Research Methodology SP - 3 VL - 18 IS - 1 AB - Improving participation rates in epidemiologic studies using questionnaires and biological sampling is important for the generalizability of the outcome. The aim of this study was to examine the effects of pre-notification, invitation length, questionnaire length, and reminder on participation rate and to investigate whether some factors contributed to participants doing both the questionnaire and blood sampling as oppose to only one part. SN - 1471-2288 UR - https://doi.org/10.1186/s12874-017-0467-5 DO - 10.1186/s12874-017-0467-5 ID - Koitsalu2018 ER -