Table 6.

Summary of multiple linear regression analysis for prediction of oral health-related quality of life (oral hygiene impact profile -14 score) by periodontal parameters

Predictors of OHRQoL	B	SE	β	t	95% CI of B (lower–upper)		P*
Constant	−0.59	4.01		−0.15	−8.47-7.30		0.88
Oral hygiene status	−0.15	0.75	−0.01	−0.19	−1.62-1.33		0.85
Plaque level	−1.51	0.86	−0.09	−1.76	−3.19-0.17		0.08
Gingival inflammation	0.64	1.10	0.02	0.58	−1.53-2.80		0.56
Probing depth (mm)	1.16	0.37	0.13	3.09	0.42-1.89		0.002
CPI score	0.73	0.61	0.05	1.20	−0.46-1.92		0.23
				Analysis of variance
Multiple R	0.37			Source	Sum of squares	df	Mean square
R 2	0.13			Regression	10341.19	11	940.11
Adjusted R2	0.12			Residual	66623.14	510	130.63
SE of estimate	11.43			Total	76964.33	521
						F=4.29; P<0.001**

*Multiple linear regression (adjusted for age, marital status, education level, employment status, income and self-esteem), significance level at P<0.05, **One-way ANOVA, significance level at P<0.05. OHRQoL – Oral health-related quality of life; OHIP-14 – Oral hygiene impact profile-14; CPI – Community periodontal index; CI=Confidence interval, B=Unstandardized beta coefficient; SE – Standard error; t – T statistics value; β – Beta coefficient; df – Degrees of freedom;

F – F statistics value; P – Probability Value; R – Multiple correlation coefficient