Table 2.

Adjusted linear regression coefficients for alpha diversity indices between P vs. H group.

Diversity metric	Coefficienta	95% CIa	P-valuea	Variance explained (Model R squared)
Observed species	1.1	−23.0 to 25.7	0.93	0.03
Chao 1	−2.7	−39.4 to 34.0	0.88	0.03
ACE	−8.7	−42.7 to 25.4	0.61	0.04
Shannon	−0.13	−0.5 to 0.3	0.53	0.04
Simpson	−0.01	−0.1 to 0.0	0.73	0.03
Inverse Simpson	−2.3	−8.6 to 4.1	0.47	0.05
Fisher's alpha	−1.5	−9.1 to 6.1	0.68	0.05

Simple linear regression with predictors Age, BOP, Gender (reference level = F), and Periodontal Status (reference level = H).

^aValues for predictor “Periodontal Status”.