Participation rates for epidemiologic studies have been declining during the past 30 years
with even steeper declines in recent years. This wholesale decrease in participation rate, or …

The first step in producing good questionnaire research is getting the right questionnaire. 1
However, even the best questionnaire will not get adequate results if it is not used properly …

Advances in Telephone Survey Methodology: The Causes and Consequences of Response
Rates in Surveys by the News Media and Governm Page 1 499 CHAPTER 23 The Causes and …

Background The number of female smokers developing chronic obstructive pulmonary
disease (COPD) is rapidly increasing, but whether or not there exists a differential …

Since non-response may jeopardize the validity of studies, comprehensive assessment of
non-response is a prerequisite for proper interpretation of study findings. Recently, the …

Rationale: There is limited knowledge about the relationship between respiratory symptoms
and quantitative high-resolution computed tomography measures of emphysema and airway …

Abstract The Heinz Nixdorf Recall Study is an ongoing population-based prospective
cardiovascular cohort study of the Ruhr area in Germany. This paper focuses on the …

METHODOLOGY REPORT Page 1 Helsinki 2008 Kansanterveyslaitos Folkhälsoinstitutet
National Public Health Institute Kansanterveyslaitoksen julkaisuja B 26 / 2008 Health 2000 …

BACKGROUND: Worldwide, asthma and COPD are common causes of disability or death.
Few studies have been made concerning the association with socioeconomic status (SES) …

Purpose Reference values for patient-reported outcome measures are useful for
interpretation of results from clinical trials. The study aims were to collect Norwegian SF-36 …