Statistical Analysis of Virome Studies. The demographic correlates for the Presence of ATCV-1 DNA was calculated by χ2 analysis for categorical
variables such as sex, race, cigarette smoking, history of travel outside of
North America, and place of birth and by two-way analysis of variance for
continuous variables such as age, level of education, BMI score, and maternal education, the latter being used as a marker of socioeconomic status (51). Individual performances on the cognitive tests described above were further compared with the performance of individuals who did or did not have detectable ATCV-1 genomes in their pharynx using linear regression models incorporating the covariates of age, sex, race, educational level, maternal education, cigarette smoking, and place of birth. Logistic regression models were used to calculate the odds ratios, which define the association between the presence of ATCV-1 DNA in the throat with low performance on