There is increasing interest in CO2 looping cycles that involve the repeated calcination and carbonation of the sorbent as a way to capture CO2 from flue gases during the carbonation step and the generation of a pure stream of CO2 in the oxyfired calcination step. In particular, attrition of the material in these interconnected fluidized bed reactors is a problem of general concern. Attrition o...

Attrition is a disruptive problem in residency training programs. Resident attrition has been more thoroughly investigated and reported in other medical fields with limited data specific to otolaryngology. Using a Web-based survey of otolaryngology residency program directors, information regarding a 5-year cohort of residents was collected. The survey response rate was 61% (59 of 97 programs),...

As survey response rates decline, correlates of survey participation may also be changing. Panel studies provide an opportunity to study a rich set of correlates of panel attrition over time. We look at changes in attrition rates in the American National Election Studies from 1964 to 2004, a repeated panel survey with a two-wave pre-post election design implemented over multiple decades. We exa...

OBJECTIVE To examine attrition variables in randomized controlled trials of cognitive behavioral interventions for children with chronic illnesses. METHODS We examined attrition rates reported on 40 randomized cognitive behavioral interventions published in six pediatric research journals, during the years 2002-2007. Intervention focus was limited to children with a chronic medical condition,...

Progress in improving animal welfare is currently limited by the lack of objective methods for assessing lifetime experience. I propose that telomere attrition, a cellular biomarker of biological age, provides a molecular measure of cumulative experience that could be used to assess the welfare impact of husbandry regimes and/or experimental procedures on non-human animals. I review evidence fr...

Treatment completion by violent offenders results in fewer victims and less violence in society. As researchers and members of society, we have a compelling interest in finding ways to keep violent male offenders in effective treatment programs. This study examines file-rated predictors of treatment attrition from an institutionally based program for persistently violent offenders. Each of the ...

BACKGROUND We report levels and determinants of attrition in Rwanda, one of the few African countries with universal ART access. METHODS We analyzed data abstracted from health facility records of a nationally representative sample of adults [≥ 18 years] who initiated ART 6, 12, and 18 months prior to data collection; and collected facility characteristics with a health facility assessment qu...

BACKGROUND Attrition in pediatric weight management negatively impacts treatment outcomes. A potentially modifiable contributor to attrition is unmet family expectations. This study aimed to evaluate the association between adolescent and parent/guardian treatment expectations and attrition. PATIENTS AND METHODS A prospective, nonrandomized, uncontrolled, single-arm pilot trial was conducted ...

It is well known that non-random attrition can lead to bias in estimating treatment effects from a social experiment that is based on random assignment. If the randomized intervention suffers from non-random attrition, the intent to treat (ITT) estimator is biased and the IV estimator of the treatment effect is also inconsistent (Frangakis and Rubin 1999). DiNardo, McCrary and Sanbonmatsu (2006...

BACKGROUND The aim of this study was to determine adherence and attrition rates in a lifestyle intervention for people with metabolic syndrome. METHODS Adherence and attrition data from a randomized controlled trial were collected. Participants were classified as adherence group if they completed assessments at 3 and 6 months follow-up and as attrition group if they did not. Physical activity...