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Smoking status used data from the EQ-5D questionnaire with subjects categorised as current, ex or never smokers.
During data collection, some subjects were lost due to the length of Phase II of the questionnaire with subjects being unable to complete interviews prior to leaving the queue for their appointment.
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To validate the questionnaire with nonelderly subjects, a second study was conducted by Menéndez, Cuevas-Toro, Pérez-Padilla, and Lorence (2016) with a total of 350 adults under the age of 65.
The EDIZ is a 5-point Likert scale screening questionnaire with 9 subjects to measure the self-perceived burden from informal care.
The present study investigated the ease/difficulty of completion as well as the time of completion of the five outcomes instruments, including the two HRQL questionnaires, the two utility questionnaires and the productivity/activity questionnaire by subjects with COPD.
Each interviewer used structured protocol to conduct the interview and filled out a prestructured paper questionnaire with answers obtained by subjects (questionnaires are available upon request).
In a post-test questionnaire, the subjects were presented with real work scenarios that require the use of spatial information and asked which format should be used to complete the task.
Using the photophobia questionnaire, subjects with interictal photophobia obtained a mean score of 7.9 (standard deviation [S.D.] = 3.9), migraine subjects without interictal photophobia obtained a mean score of 0.9 (S.D. = 0.5) and control subjects had a mean score of 1.0 (S.D. = 0.7).
The course of the exposure assessment is displayed in figure 2. The exposure assessment starts with a self-administered questionnaire among subjects who agreed to participate and gave written informed consent.
Detailed protocol along with questionnaire was subjected to refinement in these meetings.
Larenas-Linnemann's study included blinded skin testing and questionnaires of subjects with AR in Mexico.
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