Table 2 Effect of probing depth and RA on alpha diversity of subgingival microbiome

Probing depth

(ref: shallow)

26.50 ± 14.41SE,

p = 0.087

1.93 ± 0.73SE,

p = 0.022

− 0.09 ± 0.28SE,

p = 0.749

RA status

(ref: control)

8.45 ± 22.01SE,

p = 0.704

0.60 ± 1.10SE,

p = 0.688

− 0.28 ± 0.40SE,

p = 0.482

Probe depth × RA status

− 18.20 ± 23.08SE,

p = 0.443

− 1.08 ± 1.20SE,

p = 0.384

0.52 ± 0.45SE,

p = 0.275