Selection bias was kept minimal by bringing questionnaires to randomly selected clinics.
Twenty-one parents did not complete the anxiety and depression questionnaire mainly because parents forgot to bring the questionnaire to the follow-up clinic.
Subjects were asked to bring the questionnaire with them to the baseline measurement appointment or sent it back in a pre-stamped envelope.
The self-report QIDS-SR16 was sent to the participant about two weeks prior to the assessment, with the request to fill in the questions and bring the questionnaire along to the research assistant.
Each participant brought the questionnaires to O-Ringen where they were collected by the researchers.
All participants brought completed questionnaires to a health screening centre located in the town.
The participant then brought the questionnaire in for the assessment visit with the nurse.
Content validity has been pursued by means of face-to-face interviews with hospital employees and patients during the pretesting stage, which has brought about questionnaire revisions based on their views regarding the significance of various items.
The children were asked to bring the completed questionnaire to school.
Students (6-12 years old) were asked to take the forms home for their parents to fill in, and to bring the completed questionnaire to school.
