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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