Attrition analysed in five waves of a longitudinal yearly survey of smokers: findings from the ITC Netherlands survey.

ABSTRACT:

Background

Attrition bias can affect the external validity of findings. This article analyses attrition bias and assesses the effectiveness of replenishment samples on demographic and smoking-related characteristics for the International Tobacco Control Netherlands Survey, a longitudinal survey among smokers.

Methods

Attrition analyses were conducted for the first five survey waves (2008-12). We assessed, including and excluding replenishment samples, whether the demographic composition of the samples changed between the first and fifth waves. Replenishment samples were tailored to ensure the sample remained representative of the smoking population. We also constructed a multivariable survival model of attrition that included all five waves with replenishment samples.

Res

SUBMITTER: Zethof D 

PROVIDER: S-EPMC6363102 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature