Table I.

Relationship between Plasma miR 21 expression and Clinicopathological variables of Oral Cancer.

Characteristic		Number	Mean ± Standard Deviation	Confidence Interval	P-value
Age	< 40 yrs	36	29.91± 4.2	-1.402 to 2.621	0.549
	>40 yrs	64	29.30± 5.18
Sex	Male	69	29.91± 4.87	-0.840 to 3.313	0.240
	Females	31	28.67±4.67
Smoking status	Yes	66	29.98±4.7	-0.696 to 3.35	0.196
	No	34	28.65±4.94
Grade	Well differentiated	14	29.5± 4.8		0.490
	Moderate differentiated	70	29.8±4.6
	Poor differentiated	16	28.2± 5.6
Tumor Size	< 4cm	50	31.37± 3.69	1.91-5.48	<0.001
	≥ 4 cm	50	27.67±5.1
Nodal Status	Node negative	6	29.18± 4.67	-4.43 to 3.70	0.859
	Node Positive	94	29.5±4.8
Metastasis	No	93	29.8±4.7	1.53 to 9.41	0.007
	Yes	6	24.4±4.42
Local Invasion	No	81	30.06±4.54	0.4124 to 5.214	0.022
	Yes	19	27.2±5.5