Table 2 Basic characteristics of cohort 2 patients.
|  | Total n = 50 | Group 1a n = 25 | Group 2b n = 25 | P value |
|---|---|---|---|---|
Age | Â | Â | Â | 0.754 |
 >65 | 14 (28%) | 8 (32%) | 6 (24%) |  |
Sex | Â | Â | Â | 0.490 |
 male | 48 (96%) | 23 (92%) | 25 (100%) |  |
Hypertension | Â | Â | Â | 0.769 |
 Yes | 18 (36%) | 10 (40%) | 8 (32%) |  |
Diabetes | Â | Â | Â | 1.000 |
 Yes | 5 (10%) | 2 (8%) | 3 (12%) |  |
Drinking | Â | Â | Â | 1.000 |
 Yes | 37 (74%) | 18 (72%) | 19 (76%) |  |
Smoking | Â | Â | Â | 1.000 |
 Yes | 37 (74%) | 18 (72%) | 19 (76%) |  |
Subregion | Â | Â | Â | 0.729 |
 Pyriform sinus | 29 (58%) | 14 (56%) | 15 (60%) |  |
 Postcricoid | 1 (2%) | 1 (4%) | 0 (0%) |  |
 Posterior pharyngeal | 5 (10%) | 3 (12%) | 2 (8%) |  |
 ≥2 subregions | 15 (30%) | 7 (28%) | 8 (32%) |  |
cT classification | Â | Â | Â | 0.776 |
 1–2 | 28 (56%) | 13 (52%) | 15 (60%) |  |
 3–4 | 22 (44%) | 12 (48%) | 10 (40%) |  |
cN classification | Â | Â | Â | 0.754 |
 1 | 14 (28%) | 8 (32%) | 6 (24%) |  |
 2–3 | 36 (72%) | 17 (68%) | 19 (76%) |  |
C stage | Â | Â | Â | 0.742 |
 3 | 12 (24%) | 7 (28%) | 5 (20%) |  |
 4 | 38 (76%) | 18 (72%) | 20 (80%) |  |
