Table 5.

Correlation analysis of salivary parameters with variables related to habit, biographic, clinical stages, and histopathological grades

S. N.	Variable	Salivary parameters				Habit related		Biographic related		Clinical and histopathology related
		TBARS	Nitrates	GST	Uric acid	Duration of habit	Frequency of habit	Age	Gender	Site	Clinical stage	HP grade
1	TBARS	—	0.000‡ (0.848)	0.000‡ (−0.812)	0.000‡ (−0.719)	0.089 (−0.273)	0.024* (0.357)	0.307 (−0.166)	0.010* (0.401)	0.104 (0.261)	0.000‡ (0.848)	0.000‡ (0.709)
2	Nitrates	0.000‡ (0.848)	—	0.000‡ (−0.96)	0.000‡ (−0.87)	0.287 (−0.172)	0.042* (0.324)	0.672 (−0.069)	0.008† (0.411)	0.727 (0.057)	0.000‡ (0.961)	0.000‡ (0.864)
3	GST	0.000‡ (−0.812)	0.000‡ (−0.966)	—	0.000‡ (0.909)	0.516 (0.106)	0.054 (−0.307)	0.905 (−0.019)	0.007† (−0.422)	0.528 (−0.103)	0.000‡ (−0.963)	0.000‡ (−0.906)
4	Uric acid	0.000‡ (−0.719)	0.000‡ (−0.878)	0.000‡ (0.909)	—	0.810 (−0.039)	0.012* (−0.392)	0.560 (−0.095)	0.044* (−0.321)	0.776 (0.047)	0.000‡ (−0.899)	0.000‡ (−0.859)

Pearson and spearman correlation is applied at 95% confidence interval for quantitative (TBARS, nitrates, GST, uric acid, duration of habit, frequency of habit, and age) and qualitative (gender, site, clinical stages, and histopathological grades), respectively. TBARS = thiobarbituric acid reactive substances, GST = glutathione S-transferase, HP = histopathological *P value < 0.05; †P value < 0.01; ‡P value < 0.001.