Note: Because missing values are removed from this dataset, any form of non-response (e.g. valid skip, not stated) or don't know/refusal cannot be coded as a missing. The \"Sysmiss\" label in the Stat
These data are from a survey of fourth grade students in Gansu Province, China conducted in October 2010. The survey covered 2686 students in 70 schools located across 5 counties in the province. The
