About: http://webisa.webdatacommons.org/342934034

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	All of the studies measured demographic variables, such as age, sex, race, ethnicity and varying socio-economic variables.
http://www.w3.org/ns/prov#wasQuotedFrom	nel.gov