Research outlets are increasingly adopting open data policies as a requisite for publication, including studies with human subjects data. We investigated whether open data policies influence participants' rate of consent by randomly assigning participants to view consent forms with and without discussion of open data policies. No participants declined to participate, regardless of condition, no...

Female twin pairs were identified from birth records, and their families invited to participate in a prospective study of the determinants of alcohol problems in women. We investigated sampling biases arising because of failure to locate families, or non-cooperation of families. Out of 2644 families with a live-born pair (born between July 1975 and December 1986) who survived beyond infancy, co...

BACKGROUND The Cohort Multiple Randomised Controlled Trial (cmRCT) is a newly proposed pragmatic trial design; recently several cmRCT have been initiated. This study tests the unresolved question of whether differential refusal in the intervention arm leads to bias or loss of statistical power and how to deal with this. METHODS We conduct simulations evaluating a hypothetical cluster cmRCT in...

BACKGROUND The aims of this study are to describe the methodological challenges in recruiting a follow-up sample of children referred to an interdisciplinary hospital child protection team (CPT) and to compare participating versus non-participating groups on several demographic variables and maltreatment characteristics. METHODS Of the 319 in- and outpatients referred to the CPT at University...

following beebe, takahashi, and uliss-weltz’s (1990) classification, this study examines the relationship between power and gender of the addressees and the type and number of refusal strategies employed by sarawani baloch male university students (sbmus). fifty sbmus studying in azad university of sarawan were randomly chosen as the participants of the study. data collection was accomplished t...

• Objective: To determine what annual increase in malpractice premiums would be acceptable to academic physicians at a large institution. • Methods: All 270 full-time physician faculty in the department of medicine at Johns Hopkins University School of Medicine in 2004 were invited to participate in this study. A contingent valuation approach was used to assess willingness to accept a specified...

General practitioners participating in a multipractice study were compared with those who refused to participate. We found that younger doctors, doctors in partnerships, and doctors with many patients were represented more among participants. However, no correlation was found between the number of patients examined for urinary tract infection in connection with the study.