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The postal response rate was 44.9% in the case of Spain and 555 cases were finally included in this study.
The typically low postal response rate merits a note of caution in that those participating may be more enthusiastic about engaging with their families.
In Europe, studies[ 11, 68, 69] reported postal response rates ranging from 71 to 92%; in the United States, published studies reported response rates as low as 60% [ 70] and 40% [ 71] for postal questionnaires.
The overall postal response rate among the remaining women was 432/832 (52%) and among these 832 women the likelihood of responding to the survey was related to EPDS screening score such that women who had higher scores were less likely to respond.
Partly as a consequence of this timing, we had a postal response rate of just above 50% and it remains unknown if a self-selection bias could have affected our results, although given the relatively weak relationships of acceptability and opinions on screening with timing and EPDS score among the respondents we expect the broad shape of our findings to be quite robust.
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The postal responses were received from respondents having technical problems with the online questionnaire.
It is self-administered, suitable for face-to-face and postal responses and for research.
A total of 52 responses were obtained; 50 online and two postal responses, giving a response rate of 52%.
We therefore defined the rule that for postal responses >2 days after the send out of a reminder was classified as having received a reminder, for online responses >1 day and for telephone interviews 0 days.
The full set of postal responses to the 1995 questionnaire survey was used to assess effectiveness by estimating PPV of the scoring system in detecting undiagnosed asthmatics in the community.
Of the 2,638 non-metropolitan participants aged 18 years and over who gave informed consent and completed the ARMHS baseline postal survey (response rate 27%) a selected sample of 634 participants completed the WMH-CIDI-3.0 suicidality module (response rate 73%).
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