Non-invasive assessment of periodontal inflammation by continuum-removal hemodynamic spectral indices

Table 2 Correlations between HSIs and clinical parameters

HSIs	PD (mm)	CAL (mm)	BI	PLI
\({{\text{NDHbO}}}_{2}{\text{I}}\)	− 0.491*	− 0.591*	− 0.315*	− 0.203*
\({\text{NDHbI}}\)	− 0.444*	− 0.529*	− 0.296*	− 0.215*
\({\text{tHb}}\)	0.408*	0.510*	0.258*	0.195*
\({{\text{D}}}_{{\text{Hb}}}\)	0.441*	0.525*	0.297*	0.210*
\({{\text{D}}}_{{{\text{HbO}}}_{2}}\)	0.420*	0.529*	0.261*	0.190*

HSIs, hemodynamic spectral indices; NDHbO2I, normalized difference index of oxyhemoglobin; NDHbI, normalized difference index of deoxyhemoglobin; tHb,\({{\text{D}}}_{{\text{Hb}}}\), \({{\text{D}}}_{{{\text{HbO}}}_{2}}\) represent spectral absorption depths of total hemoglobin, deoxyhemoglobin and oxyhemoglobin, respectively; PD: probing depth; CAL: clinical attachment loss; BI: bleeding index on probing; PLI: plaque index. Statistical significance at the 0.05 level denoted by *

ISSN: 2047-783X