Overall, therefore, against a background of declining response rates in surveys in the UK[ 9] and in many cohort studies[ 10] more focused efforts to prevent attrition are required to ensure the benefit of the findings from cohort studies to public health do not become limited.
In order for the GOK and donor agencies to strategically invest in expanding pre-service nursing education to scale-up Kenya's health workforce, accurate training capacity and student attrition data is required to support evidenced-based strategies to increase the number of licensed and registered nurses.
Since there was no follow-up with drop-outs in this study to determine reasons for attrition, future research is required to identify barriers to learning and the extent of perceived need for resilience training, especially in nonprofessional hospital staff for whom drop-out rates were highest.
It is also shown that the minimum bubble attrition velocity is far larger than the minimum fluidizing velocity because energy is required to produce attrition.
Further research is required to address the issue of attrition, and to find ways of encouraging retention.
To obtain a reliable measure of telomere attrition rate, repeated sampling of the same individual over time is required.
While quality improvement was reported, caution is required in assessing the impact due to a high attrition rate.
Allowing for an attrition rate of 20% by the end of 24 months, a total sample size of 55 women is required.
It would certainly be an extreme contrast to the war of attrition that Calzaghe was required to fight against the 43-year-old Hopkins, who knocked the Welshman down in the first round and was a winner on the card of one of the three judges and in the opinion of a considerable section of the American media, including the Associated Press, which gave him a one-point margin.
To detect an increase of 5% in the total score and a relative variation of more than 10% of the baseline score between trial arms, with an alpha risk of 5% and a beta risk of 20%, and anticipating 20% attrition, 85 dyads are required per group.
