<http://webisa.webdatacommons.org/prov/471818292>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/140682428> .
<http://webisa.webdatacommons.org/140682428>	<http://www.w3.org/ns/prov#value>	"A characteristic, such as age or gender, used to select controls." .
<http://webisa.webdatacommons.org/prov/264896931>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/140682428> .
<http://webisa.webdatacommons.org/140682428>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<nap.edu> .
<http://webisa.webdatacommons.org/140682428>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .