PMC:7796111 / 26254-26481 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T182","span":{"begin":85,"end":146},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"eported PCR testing (swab and saliva) completion was used as the dependent variable. Gender was dummy coded, with males set as the referent group. Covariates (gender and year of study) were entered in block one (forced entry), "}