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

Table 3

Pearson’s correlation coefficients between change of CAL and the independent variables in the all subjects (N = 45).

Independent variables	𝑟^∗ between ΔCAL and the independent variables	P value
Variables at baseline
Age (years)	−0.058	0.707
Teeth present (n)	0.048	0.754
PPD (mm) at baseline	−0.427	0.003
CAL (mm) at baseline	−0.138	0.367
BOP (%) at baseline	−0.048	0.752
PCR (%) at baseline	0.240	0.112
ROM (CARR U) at baseline	0.134	0.381
BAP (μmol/L) at baseline	0.004	0.982
Differences of variables
ΔTeeth present (n)	−0.288	0.055
ΔPPD (mm)	0.583	<0.001
ΔBOP (%)	0.021	0.891
ΔPCR (%)	0.115	0.450
ΔROM (CARR U)	0.078	0.609
ΔBAP (μmol/L)	−0.085	0.599

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.