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A total of 6,023 and 3,396 eligible participants were assigned to the mail and telephone modes, respectively, and invited to complete the survey.
It also raises concerns about the validity of comparing countries using different data collection methods, especially postal vs. telephone modes and especially for questions affected by social desirability.
The database programming included branching, so that questions deemed irrelevant based on a previous response were not presented to participants in the internet or telephone modes, minimising completion time.
Analysis of costs per valid survey returned showed that the postal survey mode was the most cost-effective, with only minor differences between personalised and generic approaches, but internet and telephone modes were more costly.
Both those with NO history of any CRC screening in the REP and those WITH a history of at least one CRC screening in the REP were purposively sampled at an approximate 2 1 ratio and randomly assigned to the mail or telephone modes.
Our results verify that the EQ-5D-3L™ descoretive score and VAS can be utilized in the paediatric injured population for collecting HRQL data, whether self-reported or proxy reported, and that these data can be validly collected using paper-pencil, online or telephone modes of administration.
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We therefore have employed the telephone mode for administering the questionnaire.
The telephone mode may have contributed to overall higher scores on the PPQ, but this does not affect the construct validity presented in this study.
Simultaneously considering mode and future intention, we observed that the effects of the telephone mode (vs. mail) and future intention question were virtually unchanged (OR = 1.12 and 1.18, respectively).
When considering all tests combined, the percentage of false negatives within the telephone mode was slightly higher for those with the future intention question (6.7% vs 4.2%, p = 0.04).
For those randomly assigned to the telephone mode, the interviewer first completed the interview and then indicated that in order to use the supplied interview data, the respondent would have to fill out a HIPAA Authorization Form HAFF).
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CEO of Professional Science Editing for Scientists @ prosciediting.com