Generalized anxiety disorder (GAD) is common in older adults and, although cognitive behavioral therapy (CBT) is an efficacious treatment for late-life GAD, effect sizes are only moderate and attrition rates are high.
Indeed, Börsch-Supan et al. [7] explain that in some waves there are a relative low response rates and moderate levels of attrition (even though the overall response rate is high compared to other European and US surveys4) which are due to the economic crisis faced by some countries, implying a decrease in the participation rates.
In population-based studies, psychological distress has been found to have no effect or a weak to moderate effect on attrition after adjusting for other variables [ 2, 4, 9, 10].
A limitation of the study is its moderate size and selective attrition.
Estimating the exact likelihood of these outcomes is challenging, but the attrition rate for moderate Republicans has been high in recent cycles, especially in New England.
The possibility of attrition from more moderate Republican voters and independents is one reason why some Republican party leaders assume Democrats will retain the presidency and are already taking precautions to stem losses elsewhere.
Even at moderate to strong dependencies between attrition and follow-up variables, estimates of associations between variables seem to be generalizable.
The strengths of the present study include that it was based on a large sample with a national coverage, that well-known instruments were used, and that the attrition rate was moderate and appears to have had little effect on the results.
Applying snapshot PK studies to categorize the oral exposure of >1300 discovery compounds as low, moderate or high resulted in an attrition rate of 86%.
