Table 1.

Patient and tumor parameters

Parameter	T1N0	T2N0
	Patient no. (%)	Patient no. (%)
All stages	433	262
T1a	324 (74.8%)	-
T1b	109 (25.1%)	-
Gender
Male	413 (95.3%)	249 (93.8%)
Female	20 (4.6%)	13 (4.9%)
Grade
Well differentiated	154 (35.5%)	64 (24.4%)
Mod differentiated	273 (63.0%)	179 (68.3%)
Poorly differentiated	6 (1.3%)	19 (7.2%)
Anterior commissure involved
Yes	197 (45.4%)	186 (71%)
No	236 (54.1%)	76 (29%)
Impaired mobility
Yes	Not apply	51 (19.4%)
No		211 (80.5%)
Sub-glottic extension
Yes	Not apply	80 (31%)
No		182 (69%)
Hb level
< 13 g/dL	45 (10.4%)	28 (10.6%)
≥ 13 g/dL	388 (89.6%)	234 (91.4%)

Abbreviations: no. = number; Hb = Hemoglobin.