In my area the schools rated as "good" or "outstanding" are mostly grammar schools and the remaining high schools are mostly not.
For example, 36.5 and 53.8 percent of the schools rated complaints of peer harassment and discrimination of disabled children as "never" and "rarely" respectively.
Schooling rates are even more informative: the schooling rate for kindergarten (5 years) was 78.8% in 2001 and climbed to 91.4% in 2010 (National Institute of Statistics and Census 2012).
The schooling rate was higher among children treated medically for intracranial hypertension of traumatic cause, p = 0.012.
It should be noted that the schooling rate is very high in Vietnam, at around 95% for the primary and lower-secondary school.
On the other hand, the schooling rate for 4-year-olds in 2001 was 48.2% and increased to 69.8% in 2010.
According to the 2010 statistics of Ministry of National Education, the early education schooling rate increases with reference to age and schooling rate for 60-72 month-olds is almost 15 times greater than the schooling rate for 36-48 month-olds.
The school response rate was 90%, while the student response rate was 89%, and the overall response rate (i.e., the school rate multiplied by student rate) was 80%.
Moreover, apart from the age range, if the schooling rate is high enough, a fairly reasonable degree of representation could be achieved.
Subjects reporting a work ability score lower than six are considered to rate their own work ability as insufficient (in analogy with the school rating system in the Netherlands).
