About: http://webisa.webdatacommons.org/199159868

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	For demographic variables including age, sex, education and income levels, null hypotheses of ???no difference??? were tested using SPSS 14.0.
http://www.w3.org/ns/prov#wasQuotedFrom	plos.org