Validity assessment of quantitative light-induced fluorescence-digital (QLF-D) for the dental plaque scoring system: a cross-sectional study

Table 6 Correlation coefficients of anterior/posterior teeth among the QLF-D scores, PHP score, GI scores, BOP score and PD scores (N = 33)

	QLF-D score	Δ R30	Δ R70	Δ R120	PHP	GI	BOP	PD
Anterior teeth
QLF-D score	1
Δ R30	0.922^**	1
Δ R70	0.818^**	0.822^**	1
Δ R120	0.444^**	0.439^*	0.820^**	1
PHP	0.800^**	0.780^**	0.756^**	0.489^**	1
GI	0.757^**	0.752^**	0.576^**	0.340	0.778^**	1
BOP	0.748^**	0.761^**	0.674^**	0.462^**	0.750^**	0.868^**	1
PD	0.410^*	0.515^**	0.548^**	0.477^**	0.518^**	0.535^**	0.535^**	1
Posterior teeth
QLF-D score	1
Δ R30	0.976^**	1
Δ R70	0.823^**	0.826^**	1
Δ R120	0.700^**	0.709^**	0.952^**	1
PHP	0.682^**	0.717^**	0.499^**	0.421^*	1
GI	0.674^**	0.680^**	0.469^**	0.357^*	0.756^**	1
BOP	0.541^**	0.555^**	0.302	0.202	0.696^**	0.842^**	1
PD	0.694^**	0.692^**	0.541^**	0.455^**	0.557^**	0.806^**	0.661^**	1

QLF-D Quantitative Light-Induced Fluorescence-Digital, QLF-D ⊿R score redness differences of 30, 70, and 120% between the teeth and the red plaque observed on the QLF-D photograph, PHP index Patient hygiene performance index, GI Gingival index, BOP Bleeding on probing, PPD Probing pocket depth
^*P < 0.05
^**P < 0.01

ISSN: 1472-6831