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The 176 initial respondents were re-screened using the same instruments at 24 months post-treatment, when 137 (78%) of the original respondents returned completed questionnaires, at 36 months when 118 responded (67%), and finally at 48 months when 116 responded (66%).
A random selection of 2500 households in Nebraska received a survey questionnaire designed for licensed motor vehicle drivers; respondents returned 980 questionnaires.
Respondents returned the questionnaire anonymously.
No respondents returned their data via fax.
Overall, 84% of respondents returned the questionnaire.
Forty-one respondents returned the pilot questionnaire.
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On average, approximately 90% of all HILDA survey respondents return a completed SCQ for each wave.
The use of incentives did not alleviate the existing gender and age biases in participation, with more girls and younger respondents returning questionnaires.
The number of respondents returning this slip was higher in the 'opt in' group (240/711, 33.7%) than in the 'opt out' group (150/711, 21.1%) and this difference was significant (χ=28.60, p-value<.01).
While the number of respondents returning questionnaires exceeded the minimum sample size requirements, the skewed scores of some subscales indicated the lack of uniformity of sample distribution which would have given the greatest degree of precision for item and person estimates.
Staff from these services provided a sample size of 194, yielding a response rate of 69% (the number of respondents returning a questionnaire as a percentage of all identified clinical staff in participating agencies), after a second wave that involved a telephone reminder.
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