Consistent predictors of attrition in weight loss trials have not been identified.
Previous studies have not found any consistent association between attrition and social class.
We observed shorter telomeres in tumors with greater numbers of amplifications, consistent with telomere attrition promoting this type of copy number aberration in breast tumors.
Furthermore, age-associated shortening rates become consistent with longitudinal attrition rates when PBY is included instead of FAB (39.44 bp/year in the PBY model compared with 22.18 bp/year in the FAB model).
To account for 25% attrition (consistent with prior trials of ATSA) and ensure that 112 dyads in each group are available for analysis, the goal is to enroll 300 dyads in the trial [ 26].
The experimental results are consistent with predictions of attrition fragments arising from crystal-impeller collisions, with a strong effect of impeller hardness on the average attrition rate, together with turbulent fluid drag-induced particle attrition.
The data indicate that, under operating conditions similar to those found in industrial crystallizers, secondary nuclei are produced by a particle attrition process consistent with a turbulent fluid-induced breeding mechanism having critical eddies in the viscous dissipation subrange of the turbulent energy spectrum.
This is consistent with previous observations of attrition in other systems that employ these materials.
Limitations of this study include substantial attrition, which is consistent with other studies of Internet-based health interventions with minimal human support (Eysenbach, 2005; Khadjesari et al., 2011).
This high attrition rate is consistent with previous longitudinal studies of advanced cancer patients (McMillan et al, 1999; Vigano et al, 2000; Lundholm et al, 2004).
This approach will also allow the investigators to determine if the attrition rates were consistent across companies throughout the length of the study.
