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With regard to the value of the stem questions vis-à-vis clinical cross-questioning, we were able to establish the positive predictive value for each item, but unfortunately the logistics of the available clinic time did not allow us to assess negative replies further to investigate the proportion of potentially false negatives.
In the Fishermen Study, the occurrence of depressive episodes was determined using the CIDI-SF stem questions "During the past 12 months, have you felt sad, blue or depressed for at least two weeks?" and "During the past 12 months, have you lost interest in most things like work or hobbies or things you usually like to do for fun for at least two weeks?" [16].
For screening, two stem questions had level 1b evidence.
As they are highly acceptable, the stem questions are thus recommended (grade B recommendation).
For case-finding, one stem question, two stem questions and the BDI-II all had level 2 evidence.
The interviews took 45 60 minutes and consisted of the same stem questions used for all participants.
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For example, we changed the response categories for some questions and the stem question for others.
16 Those answering YES to two or fewer symptom questions and all those answering NO to the initial stem question were classified as controls.
The stem question for the knowledge scale of warning signs is phrased as; "The following may or may not be warning signs for bowel cancer.
The stem question for the knowledge scale of risk factors is phrased as; "The following may or may not increase the chance of developing bowel cancer.
The interviewer read out a stem question from the interview schedule and then presented a card with 'yes', 'no' or 'maybe' responses.
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CEO of Professional Science Editing for Scientists @ prosciediting.com