Other limitations we noted were small sample size, variability of follow-up periods, and inadequate information regarding factors such as home environment, education, and level of stimulation.
Respondents' characteristics that affect the probability of belonging to a latent preference class are environmental behaviour and attitude, actual living environment, age class, education level, and organisation membership.
In the case of SES update at year 9, the low percentage of missing covariate data was estimated with reasonable accuracy using a multiple stepwise regression with previous Hollingshead SES, the latest HOME measure of the environment, and maternal education level (multiple r = 0.67, p < 0.0001).
At baseline, the participants filled in an extensive questionnaire covering different occupational aspects (e.g., work tasks, work hours, and work environment), sociodemographic aspects (e.g., education level), and lifestyle habits (e.g., smoking and physical exercise) as well as different aspects of health.
Education level was classified into four categories: No education, primary education, secondary education and higher education.
For 9th graders, effects did not differ by parents' education level or school environment, but they did differ by the student's prior year's test performance.
Fan, Q. et al. Meta-analysis of gene-environment-wide association scans accounting for education level identifies additional loci for refractive error.
Meta-analysis of gene-environment-wide association scans accounting for education level identifies additional loci for refractive error.
Six socioeconomic variables were obtained from the above assessments; quality of the home environment (MC-HOME score), nutritional status, maternal education level, child's education level and socioeconomic status (SES) score.
Participants self-reported sexual orientation, partnerships status, education level, income, age, ethnicity, living environment and their province of territory of residence.
