The final protocol, described in detail in Oppe et al. [ 5], includes software for use in computer-assisted personal interviews, an interviewer script, interviewer training materials, guidance to researchers and tools for data analysis.
Blinding interviewers to participants' case controls status is impossible in personal interviews, but interviewers were trained to treat everyone equally and information on mobile phone use was collected with a highly structured and standardized computer-assisted interview.
Both surveys were conducted by specialized interviewers through personal interviews.
Trained interviewers conducted personal interviews with all participants during hospital visits using standard questionnaires.
Interviews are conducted face-to-face using Computer-Assisted Personal Interviewing (CAPI) with interviewers calling on participants in their homes.
The personal interviews by trained interviewers, with both GPs and their patients, enabled a particularly precise survey of chronic diseases.
The CHS is also representative of regional populations by sex and age groups and it was conducted by specialized interviewers through personal interviews.
A-CASI methodology has been shown to increase reporting of stigmatized behaviors relative to interviewer-administered personal interview (Perlis, Des Jarlais, Friedman, Arasteh, & Turner, 2004; Tourangeau & Smith, 1996; Turner, Ku, Rogers, Lindberg, & Pleck, 1998).
The data of the Panel Study on Korean Children were mainly collected by using the computer-assisted personal interview (CAPI) technique when interviewers visited the sampled household.
The questionnaires were administered during personal interviews by previously trained interviewers.
