Longitudinal Relationship between Plasma Reactive Oxygen Metabolites and Periodontal Condition in the Maintenance Phase of Periodontal Treatment

Table 4

Pearson’s correlation coefficients between change of CAL and the independent variables in the subjects with low oxidative status (≤380 CARR U) (N = 23).

Independent variables	𝑟^∗ between ΔCAL and the independent variables	P value
Variables at baseline
Age (years)	−0.082	0.711
Teeth present (n)	0.012	0.956
PPD (mm) at baseline	−0.268	0.217
CAL (mm) at baseline	−0.183	0.402
BOP (%) at baseline	−0.219	0.315
PCR (%) at baseline	0.305	0.157
ROM (CARR U) at baseline	0.062	0.778
BAP (μmol/L) at baseline	0.038	0.863
Differences of variables
ΔTeeth present (n)	−0.228	0.296
ΔPPD (mm)	0.660	0.001
ΔBOP (%)	0.563	0.005
ΔPCR (%)	0.487	0.018
ΔROM (CARR U)	0.443	0.034
ΔBAP (μmol/L)	0.240	0.322

Δ represents differences (value at follow-up minus value at baseline).
∗Pearson’s correlation coefficients.
N: number; SD: standard deviation; PPD: probing pocket depth; CAL: clinical attachment level; BOP: bleeding on probing; PCR: plaque control record; ROM: reactive oxygen metabolites; CARR U: Carratelli units; and BAP: biologic antioxidant potential.