Participants were given an example of think-aloud interview techn

Participants were given an example of think-aloud interview technique and then asked to verbalize their thoughts

as they answered each question in the questionnaire and to indicate the reasons for providing the answers. Prompts (calendars, maps, and festival dates) were provided and on completion of the interview all participants were administered 24 structured follow-up probe questions. Use of prompts was observed and recorded. Scripted probes were used; responses were recorded by the investigator and subsequently analyzed. Items from the cognitive interviews were refined and incorporated into the final version of the questionnaire. We were not able to find copies (printed or electronic) of any questionnaires used in published travel-related Roscovitine datasheet studies, and none of the travel studies reported a process of validation. Thirty-four pooled items were selected for inclusion in the pre- and post-travel questionnaires (version 2). Sixty-four travelers were recruited to the prospective cohort study and completed the pre-travel questionnaire; the pilot study included 23 who had returned to complete the post-travel questionnaires. The remaining 38 travelers had not returned from travel and 3 were lost to follow-up. Age of the participants

ranged from 16 to 71 (median: 36) years, 42% were male, and 27% were overseas born. Most (62.5%) were tourists. Item-specific and general problems were identified by steps 3 and 4. Item-specific FG-4592 problems were mainly related to suboptimal clarity and an inadequate number of response categories provided. Table 1 provides examples of the item-specific problems identified, classification within the QAS framework, and the final revised many items. In addition, feedback by travelers, together with observed and self-reported difficulties in the pilot study, resulted in an expansion of the draft questionnaire items from 34 to 39. Seven of 19 post-travel

questionnaire items and 7 of 15 pre-travel questionnaire items were revised. Participants’ difficulties included deciding which destinations were “rural” locations and selection of appropriate traveler type category: definitions were therefore provided in the questionnaires. Some problems applied to multiple items across the questionnaire relating to QAS-99 categories of knowledge and memory. It was recognized that complicated travel itineraries and longer travel durations would be difficult to recall and record despite follow-up consultation within 2 weeks of return from travel. Open-ended questions were not selected for the categories of accommodation type or travel activities, as it was judged too difficult a recall task for travelers with long travel durations or complicated itineraries. Instead, a list of response options was provided. Some travelers did not report destination countries or health episodes in their correct temporal order.

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