Table 2 Temporal changes of salivary microbiota. Within-subject diversity was divided into three segments following change-point analysis whereas between-subjects diversity was modeled on the full-time period since no change-points were detected. Results of mixed effect models fitted for each segment were reported in the table. b, regression parameter (slope of the model); SE, standard error; t, t-value (also known as “standardized” regression parameter); df, degrees of freedom; p,p-value.