Journal of Dental Hygiene Science

Table. 2.

Pearson’s Correlation Coefficient of the Plaque Percent Index with the Existing Dental Plaque Indices and the NPI

		PHPI	QHPI	RMNPI	NPI
Examiner 1	Anterior	0.82**	0.69**	0.71**	0.84**
	Posterior	0.62**	0.76**	0.85**	0.87**
	Total	0.75**	0.71**	0.78**	0.87**
Examiner 2	Anterior	0.70**	0.41**	0.70**	0.87**
	Posterior	0.49**	0.58**	0.61**	0.87**
	Total	0.64**	0.47**	0.69**	0.88**

PHPI: Patient Hygiene Performance Index, QHPI: Quigley and Hein Plaque Index, RMNPI: Rustogi’s Modified Navy Plaque Index, NPI: Novel Plaque Index.

**p<0.01.