PMC:7780429 / 9114-9373 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T57","span":{"begin":0,"end":107},"obj":"Sentence"},{"id":"T58","span":{"begin":108,"end":259},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Depending on the nature of the variable and the distribution of the sample, different tests have been used. We used the Χ2 test to contrast whether there is independence between two categorical variables using a contingency table when the data are not paired."}