Table 6.

Relationship between mean numbers of sextants with healthy gums of the studied young adults and selected independent variables (Negative binomial regression) (n = 324)

	Incidence rate ratio	95% CI#	p
Toothbrushing frequency
Twice or more	1.93	1.43-2.60	<0.001
Once or less a
Oral health knowledge score	1.09	1.03-1.15	0.002

The model was adjusted by all four the socio-demographic factors: Gender, education level, income household income and dental insurance coverage.

^a Reference group. ^#95% CI = 95% Confidence Interval.