Because it is difficult to obtain a sufficiently large number of patients for such a study in a clinical setting, we carried out a randomized study with interviews of a representative sample of the general population.
The development of randomized response models for personal interview surveys has attracted much attention since the pioneering work of Warner [1965. Randomized response: a survey technique for eliminating evasive answer bias. J. Amer. Statist. Assoc. 60, 63 69].
Nine hundred caregivers with children aged 6 59 months were interviewed using a randomized, 30 × 30 cluster design.
Initial interviews for a randomized trial were used to describe surrogates' perceptions of feeding options, and to determine whether a decision aid on feeding options in advanced dementia would improve knowledge, reduce expectation of benefit from tube feeding, and reduce conflict over treatment choices for persons with advanced dementia.
For validation, we took a randomized subsample of women initially interviewed with the KINDEX.
25180 individuals were selected and interviewed through a randomized systematic and cluster sampling method from all Iranian households.
During the validation procedure an expert clinical psychologist carried out diagnostic interviews with a randomized subsample of 50 pregnant women based on established diagnostic instruments for stress and psychopathology, like the PSS-14, ESI, PDS, HSCL-25.
In the experimental arm of our randomized study we will use this interview model for an assisted, structured reflection on contingent life events and ultimate life goals, which will be supported by a newly developed e-application.
Following completion of the randomized control study, a clinical psychologist interviewed a sample of subjects from each group.
In order to determine the most acceptable setting for male partner HTC, we interviewed participants in a randomized trial on their preferred setting for male partner HTC, either home-based, VCT center-based or ANC clinic-based HTC.
