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

Table 7

Multiple linear regression analysis with change of CAL as the dependent variable in the subjects with low oxidative status (≤380 CARR U) (N = 23).

Variables	B (95% CI)	β	P value
Intercept	0.044 (−0.060, 0.148)	—	0.391
ΔBOP (%)	0.013 (0.0003, 0.025)	0.349	0.045
ΔPCR (%)	0.006 (0.001, 0.010)	0.409	0.019
ΔROM (CARR U)	0.002 (0.0004, 0.003)	0.416	0.014

We used backward elimination method with a P > 0.1 threshold for exclusion to construct the Model. The candidate variables for the Model were ΔBOP, ΔPCR, and ΔROM. The F-statistic was 8.744 (P-value was 0.001), the R-square was 0.580, and the adjusted R-square of the model was 0.514. The variance inflation factor was <5 and condition index was <15.
Δ represents differences (value at follow-up minus value at baseline).
N: number, CI: confidence interval, B: unstandardized regression coefficient, β: standardized coefficient, CAL: clinical attachment level, BOP: bleeding on probing, PCR: plaque control record, CARR U: and Carratelli units.