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Results from multinomial logistic regression examining the effect of a log-unit increase of CO on number of bacterial species present (referent = 0, max = 3). Point estimate odds ratios are indicated by periods, and 98.34% confidence intervals by horizontal lines. All models adjusted for age at swab, sex, and season swabbed. p values < 0.05 are starred, but the Bonferroni-adjusted p value is 0.017. N = 208.
