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Proportions (and 95% CI) were calculated using the Surveyfreq procedure, taking into account clustering by GP practice and sample weight (as described above) for the adult/child community samples.
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Pharmacies were grouped by distance from the nearest GP practice and sampled to reflect the distribution by distance of all pharmacies in Nottingham.
Table 2 Survey practices and sample physicians B: Number of physicians and practices among treatment and control group Number of practices Number of physicians Comparison Treatment Total Comparison Treatment Total 2007 11 11 22 67 100 167 2008 4 4 8 17 35 52 2009 8 8 16 97 117 214 Total 23 23 46 181 252 433 Sources: AAOS Survey Data, 2012; CMS NPPES Downloadable File [39]; see text.
Information was collected on the management practices and samples of water, pond bottom, feed and shrimp collected throughout the production cycle.
Several factors that may vary among study participants can affect the concentrations of hopanes: cleaning practices and sampling surfaces (carpeted vs. non-carpeted) play a role in the amount of chemicals that deposit inside the homes as shown in the city-specific analysis.
The Kriging model for a target function is fitted to a set of sample points, the responses of which are expensive to obtain in practice and the sample distribution of which has a great impact on the model prediction quality.
The design consisted of a comparison sample (n = 281) that had enrolled in treatment prior to implementation of TRIP (standard operating practice) and a sample of clients that had entered treatment after TRIP began and received standard operating practice enhanced by TRIP (n = 238).
Strengths of the study included a large practice and patient sample size and an intervention based on published trials and delivered at an intensity feasible in primary care.
For each case, potential controls were frequency matched by age, gender and practice, and a sample of four controls per case then randomly selected.
This paper considers the implications of such approximations in clinical trials in practice and presents sample size for exact α levels based on the exact test.
It is likely that those who agreed to participate were reasonably confident about their own standards of practice and the sample may have been skewed towards good performance.
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