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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.

From: Defining the resilience of the human salivary microbiota by a 520-day longitudinal study in a confined environment: the Mars500 mission

Days b SE t df p
Within-subject
 1–123 0.00103 0.00027 3.86 12.00 .0023
 124–480 −0.00064 0.00012 −5.19 36.00 < .0001
 481–720 0.00123 0.00020 6.16 14.23 < .0001
Between-subjects
 1–720 −0.00004 0.00001 −3.89 424.19 .0001