According to our interpretation these findings provide preliminary evidence that respondents from the non-recommended group who self-selected into the interview—a standard problem with survey data might not have been different from recommended participants.
Although we did not ask participants to review transcripts, follow-up interviews allowed us to pursue interpretations about preliminary findings with respondents.
Upon completing these preliminary tasks, the respondents were randomized over five different specifications of TTO: lead-time TTO with a duration of 15 years and of 20 years; lag-time TTO with a duration of 15 years and of 20 years; and classic TTO with a duration of 10 years.
In this first report from the CaMEO Study, we describe methodology and design, explore nonresponse bias, and present preliminary findings on respondent demographic and socioeconomic characteristics and headache-related disability.
But overall, according to preliminary comparative results, Iranian respondents are thinking politically.
Even experienced researchers find it necessary to pretest their questionnaires, usually by interviewing a small group of respondents with preliminary questions.
A large part of the respondents at preliminary stages had opposite views to this aspect.
In order to prevent any preliminary influence on the respondents' ratings, these questions were presented only after they had rated the set of images.
A preliminary question which asked respondents whether in the previous 12 months they had cut or skipped meals (yes = 1 or no = 2) was combined with a follow-up question that asked how often they had cut/skip meals for lack of money if they answered yes to the preliminary question.
This initial design will be piloted in a sample of 100 respondents and preliminary models estimated.
