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Fig. 3 | European Journal of Medical Research

Fig. 3

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

Fig. 3

Mean comparisons of \(D_{{{\text{HbO}}_{2} }}\) (a), \(D_{{{\text{Hb}}}}\) (b), \(ND{\text{HbO}}_{2} I\) (c), \(ND{\text{Hb}}I\) (d), \(t{\text{Hb}}\) (e), \(D_{{{\text{water}}}}\) (f) for before and after periodontal therapy. Analysis of variance of each spectral index was conducted. \(NDHbO_{2} I\): normalized difference index of oxyhemoglobin; \(ND{\text{Hb}}I\): normalized difference index of deoxyhemoglobin; \(t{\text{Hb}}\), \(D_{{{\text{Hb}}}}\), \(D_{{{\text{HbO}}_{2} }}\), \(D_{{{\text{water}}}}\) represent spectral absorption depths of total hemoglobin, deoxyhemoglobin, oxyhemoglobin and tissue water, respectively. “*” indicates significant differences from the healthy group at P < 0.05. Error bars indicate standard deviation

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