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And correspondingly, it is not possible to say that there is an upper response rate at which the results are not unevenly distributed due to non-response.
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Lower and upper bounds on the response rate for the stated preference survey were 22 and 63percentt, assuming that respectively all or none of the telephone numbers which could not be contacted or verified as households were included in the denominator [ 30].
# Set up upper bound for the firing response rate calculations.
If no responses are observed, the exact binomial 95% upper confidence limit on the response rate is 9.5%, indicating that such an outcome would provide 95% confidence that the underlying response rate is below this nominal level of activity.
This rate is in the upper limit of response rates observed across multiple trials according to a recent meta-analysis that reports overall responses between 45 and 83% [32].
This result reflects the upper end of response rates reported in the literature regarding MSF feedback which ranges from 36% [ 28] to 95% [ 17].
The questionnaire stage of this study achieved a response rate at the upper end of this range – although it was based on a self-selected subset of the original population sample.
The Kaplan Meier method (Kaplan and Meier, 1958) was used to calculate TTP and survival curves and exact CIs (Lentner, 1982) were used to determine the 95% upper and lower confidence limits of response rate.
A total of 1,600 questionnaires were distributed to doctors in these hospitals, and 1,509 valid questionnaires were obtained (650 from primary hospitals and 859 from upper-level hospitals), yielding a valid response rate of 94.3%.
We focus on the upper school (grades 9 12) initially because the response rate was higher.
This response rate lies in the upper range of results of chemotherapy in breast cancer patients (Di Leo and Piccart, 1999; Nisman et al, 2003; Lombardi et al, 2004b).
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