Table 6: The statistically significant correlations between investigated parameters (N = 80).

Parameters

rho

p

Lactoferrin (ng/mL)-LPO (ng/ml)

0.405

0.001

Lactoferrin (ng/mL)-TAS (mmol Trolox equiv./L)

0.586

0.001

Lactoferrin (ng/mL)- TOS (umol H2O2 equiv./L)

0.500

0.001

Lactoferrin (ng/mL)-OSI

0.331

0.003

LPO (ng/mL)-sIgA (µg/mL)

0.250

0.026

LPO (ng/mL)-TOS (umol H2O2 equiv./L)

0.227

0.043

LPO (ng/mL)-OSI

0.269

0.016

TAS (mmol Trolox equiv./L)-TOS (umol H2O2 equiv./L)

0.451

0.001

TOS (umol H2O2 equiv./L)-OSI

0.847

0.001

PPD (mm)- Lysozyme (ng/mL)

0.383

0.001

NT- Lactoferrin (ng/mL)

0.233

0.038

CAL (mm)- Lysozyme (ng/mL)

0.324

0.003

PESA (mm2)- Lactoferrin (ng/mL)

-0.308

0.005

PESA (mm2)-LPO (ng/ml)

-0.225

0.045

PESA (mm2)- Lysozyme (ng/mL)

0.299

0.007

PISA (mm2)- Lysozyme (ng/mL)

0.369

0.001

SFR  (mL/min)-PPD (mm)

-0.339

0.004

SFR (mL/min)-AL (mm)

-0.276

0.021

SFR (mL/min)- Lysozyme (ng/mL)

-0.265

0.026

AL: clinical attachment loss, IgA: immunoglobulin A, LPO: lactoperoxidase, sIgA: salivary immunoglobulin A. SD: standard deviation, SFR: salivary flow rate, OSI: oxidative stress index, TAS: Total antioxidant status, TOS: Total oxidant status. PPD: probing pocket depth, PISA: periodontal inflamed surface area, PESA: periodontal epithelial surface area, (Spearman correlation analysis, P < 0.05).