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The overall sample response rate was 38.5%.
Of these, 95 returned a completed questionnaire (clinical sample response rate 81%).
That left 408 patients in the final sample (response rate, 59.0%).
This resulted in a total of 755 respondents (29% of the initial sample, response rate 42%) that completed the interview.
This constituted a representative sample response rate of 23% with a confidence level of 95% and an interval of 5.06.
The sample response rate for the dietary questionnaire and blood sampling in seniors was approximately 45% both in Phase I and in Phase II.
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Analyses conducted by LaRoche and Cartwright (2010) and Cosgrove et al. (2010) confirmed that the changes made to the sampling methodology did not affect the representativeness of the PISA sample, response rates, or sampling weights, in any measurable way.
Though we used probability sampling of quotas from a nationally distributed online panel to obtain the CaMEO migraine sample, response rates were low.
Overall, the ranges of interviewed and examined sample response rates for women ≥ 50 years of age were 78 81% and from 51 73%, respectively, for NHANES III [ National Center for Health Statistics (NCHS) 2008].
Moreover, NHANES III examined sample response rates were lowest for women ≥ 80 years of age, so again, the frail elderly population may be underrepresented.
We recorded whole sample response rates to the most recent wave of data collection where this was available, but this information was often missing.
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