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Time to fill in the questionnaire was allocated according to average time recorded during pre-testing (30 minutes).
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Pregnant women identified as allergic through a screening questionnaire were allocated primarily to an intervention arm (initial enrollment of 855), with a random subset allocated to the natural history arm.
Two used participant identification numbers (Ford 2006; Gates 2009), and two allocated the first half of a simple random sample of participants to receive one version of a questionnaire, while the remaining half was allocated to a second version (McColl 2003 1; McColl 2003 2).
Under the instruction of the school nurse or a trained teacher the remaining 183 children completed the questionnaires themselves during a lesson that was allocated to this task.
An average 20 25 min was allocated for administering the questionnaire for each person during the course of this study.
Adolescents in secondary education received information about the study by e-mail, and time during regular school hours was allocated to complete the questionnaire.
All interviewers and field supervisors were trained for two days on questionnaire and data collection methods, and one day was allocated for tool pretesting and reflection.
Adolescents in upper secondary education received information via their official school e-mail address, and one classroom school hour was allocated for them to complete the questionnaire.
Adolescents in secondary education received information per e-mail, and time during regular school hours was allocated for them to complete the questionnaire.
Each participant was allocated a 15 – 20 minute time slot and asked to complete a questionnaire to validate the usability of several key areas.
Therefore, a designated box was allocated in their school, and they could choose to complete the questionnaire immediately or to return it in the box later.
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