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Exact(27)
Assuming an average follow-up duration of 2.5 years and an overall attrition rate of 25% (including 5% cumulative mortality rate), the sample size of 3000 drivers would generate a total of 5600 person-years of observation and ensure a study power of over 80% for detecting a risk ratio of 3.0 with adequate adjustment for age.
According to the DOD, "Although the overall attrition rate is higher than optimal, it is not directly affecting operations in the short-term, as the ANSF [Afghan National Security Forces] remains sustainable numerically due to robust recruitment".
The overall attrition rate of teachers is much higher - many of whom would probably otherwise be cited for poor performance, but who leave the profession either willingly, or "counseled" out.
In fact the Hurricane outnumbered the Spitfire throughout the battle, and shouldered the burden of the defence against the Luftwaffe; however, because of its higher performance the overall attrition rate of the Spitfire squadrons was lower than that of the Hurricane units, and the Spitfire units had a higher victory-to-loss ratio.
Overall attrition rate (compared with baseline) was 32.4%.
The overall attrition rate was 12% (control group, 11%; intervention group, 13%; P =.70).
Similar(32)
In the future, we plan on tracking the students from our cohort to compare their attrition rates (from mathematics courses, STEM disciplines, and university as a whole) to statistical data about overall attrition rates at our institution.
Despite considerable efforts to improve the pharmacokinetic profiles of small-molecule drug candidates, overall attrition rates remain high mainly due to efficacy, safety issues, and selection of inappropriate drug targets [1 3].
Study durations ranged from 8to4848 weeks and the overall attrition rates were generally very low.
Overall attrition rates for anthropometry data collection was 3.1% (250) at six months and 6.2% (242) at 12 months.
It seems that adequate missing value management is useful in carrying out appropriate CCBT evaluation, because we expect overall attrition rates to be high.
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