For parents who had difficulty understanding the questionnaire, individual assistance was offered.
The local eligible individuals were survey-adjusted to the correspondent questionnaire (Individual User, Individual Children, Teenagers or Adults), additionally to the household characteristics questionnaire; this resulted in a sampling size of 206,700 records that represented 103,013,985 inhabitants in Mexico in 2006.
On the baseline questionnaire, individuals were asked 'was your father employed during the crisis of 1932 1940?' Cohort members could either answer yes, along with the years that he was employed, or no.
As a measure for the client's functioning in activities of daily living (ADL) the "IPLOS bistandsvariabler" questionnaire (individual-based care and support statistics, assistance variables) is used, containing 17 items that cover personal and instrumental ADL, hearing, and vision.
The local ethics committee waived the requirement for formal ethical approval because our study comprised an anonymised questionnaire; individuals provided consent by completing the questionnaire.
In the 1987 questionnaire, individuals were asked to estimate the number of hours per typical weekday and weekend day during the past year they spent in each of four activity intensity categories: sleeping, light, moderate, and vigorous activity.
Based on the information provided by the participants in the personal questionnaire, individuals were classified in five ancestral groups: African (n = 9), East Asian (n = 66), European (n = 83), South Asian (n = 64), or Other (n = 2) ancestry.
We used a mixed-methods approach with questionnaires, individual interviews and a focus group interview.
Through questionnaires, individual interviews, and video recordings (in particular of one focus group of students), different types of changes in the students' beliefs/views about mathematics as a discipline were observed.
Back to number 3 Data were collected by questionnaires, individual interviews, and focus group discussions.
In traditional quantitative approaches such as surveys or questionnaires individual subjectivities are lost.
