Table 6.

Comparison of ¹⁵N/¹⁴N and ¹³C/¹²C isotope ratio estimation in tumour and margin and clinical features.

Clinical Features		N	Delta Air Tumour Mean Value					Delta PDB Tumour Mean Value
			Mean	sd	Median	t	p Value	Mean	sd	Median	Statistical Analysis Z	t	p Value
BMI		18	8.92	0.55	8.80	−0.2378	0.815	−22.21	0.78	−22.3		−4.3198	<0.001
Depth of infiltration (mm)		18	8.92	0.55	8.80	2.0287	0.0595	−22.21	0.78	−22.3		0.3049	0.7644
Tabacco smoking	yes	10	8.91	0.67	8.69	−0.12	0.9090	−21.93	0.81	−22.3	1.02		0.3154
	no	8	8.94	0.39	8.95	−1.48	0.2828	−22.56	0.64	−22.33	2.04		<0.05
Alcohol consumption	yes	2	8.57	0.32	8.57			−20.71	0.9	−20.71
	no	16	8.97	0.56	8.83	0.99	0.336	−22.4	0.55	−22.33	2.26		<0.05
Angioinvasion	yes	11	9.03	0.65	8.85			−22,00	0.94	−22.08
	no	7	8.76	0.32	8.65	1.04	0.3123	−22.53	0.28	−22.42	1.77		0.0754
Local lumpoh nodes metastasis	yes	13	9.01	0.61	8.85	1.36	0.1918	−22.07	0.87	−22.24	1.08		0.2908
	no	5	8.71	0.28	8.75			−22.56	0.38	−22.52
Nodal capsule infiltration	yes	6	9.17	0.73	8.98	0.72	0.4800	−21.88	1.3	−21.82	0.59		0.5663
	no	12	8.80	0.42	8.78			−22.37	0.3	−22.33
Neuroinvasion	yes	5	9.08	0.72	9.04			−22.2	1.07	−22.08
	no	13	8.87	0.50	8.80			−22.21	0.7	−22.3