PMC:7417201 / 9198-9318 JSONTXT

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{"project":"LitCovid-sentences","denotations":[{"id":"T65","span":{"begin":0,"end":120},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Student’s t test and χ2 test were used to compare the differences in continuous and categorical variables, respectively."}