> -wrap-foot> The median odds ratios calculated from the variances are fairly high for the unadjusted model (model 1) at the sibling level (median odds ratio = 1.93) and school level (median odds ratio = 1.29).
The school level median household income was constructed as a composite of the household income reported by the parents of individual students attending the same schools.
We included two variables to describe the demographics of the school: the school level median household income and the percentage of the student body who are White.
When the schools are a sufficiently large collection of classrooms (as was the case in our study, where the 6 schools had between 33 to 63 classrooms, with a median class size of 31 students and inter-quartile range from 29 to 39), then the school level FRI rate reflects the average size of a transmission cluster in the classroom setting.
The median odds ratios for the variances show the sibling level to be more important than area or school level for predicting poor mental health.
The median age was 33 years; 78.2% of patients were male, 49.3% were married, 82.8% received a middle school level of education, 24.8% were engaged in commercial service and 51.8% were infected through heterosexual contact (table 1).
Looking at a more typical school, Rocky Mountain College ranked 285 -the median school in the entire sample.
When we controlled for individual and school level variables only, we found that students who attended schools with a greater percentage of white students had decreased odds of having asthma (OR = 0.87, p = 0.073) but that those students who attended schools with higher median household incomes had on average higher odds of having asthma.
The median school size was 700 students.
Education_1 = primary school level.
