Table 1 Major demographic and baseline clinical features
Characteristics | Non-drinkers | Drinkers | χ2 | P |
|---|---|---|---|---|
Gender |  |  | 31.707 | < 0.001 |
 Female | 29 (48.3%) | 2 (3.3%) |  |  |
 Male | 31 (51.7%) | 58 (96.7%) |  |  |
Age | Â | Â | 1.205 | 0.272 |
  ≤ 60 years | 25 (41.7%) | 31 (51.7%) |  |  |
  > 60 years | 35 (58.3%) | 29 (48.3%) |  |  |
Smoke |  |  | 34.66 | < 0.001 |
 No | 34 (56.7%) | 4 (6.7%) |  |  |
 Yes | 26 (43.3%) | 56 (93.3%) |  |  |
Tea |  |  | 13.807 | < 0.001 |
 No | 25 (41.7%) | 7 (11.7%) |  |  |
 Yes | 35 (58.3%) | 53 (88.3%) |  |  |
Residential distract | Â | Â | 3.429 | 0.064 |
 Zhangzhou | 30 (50.0%) | 20 (33.3%) |  |  |
 Othersa | 30 (50.0%) | 40 (66.7%) |  |  |
Sampling season | Â | Â | 2.194 | 0.139 |
 Winter/Spring | 39 (65.0%) | 31 (51.7%) |  |  |
 Summer/Autumn | 21 (35.0%) | 29 (48.3%) |  |  |
Tumour location | Â | Â | 0.185 | 0.911 |
 Upper | 5 (8.3%) | 6 (10.0%) |  |  |
 Middle | 28 (46.7%) | 29 (48.3%) |  |  |
 Lower | 27 (45.0%) | 25 (41.7%) |  |  |
T stage | Â | Â | 0.048 | 0.827 |
 1/2 | 13 (21.7%) | 14 (23.3%) |  |  |
 3/4 | 47 (78.3%) | 46 (76.7%) |  |  |
N stage | Â | Â | 0.036 | 0.849 |
 0 | 21 (35.0%) | 22 (36.7%) |  |  |
  ≥ 1 | 39 (65.0%) | 38 (63.3%) |  |  |
Stage | Â | Â | 0.000 | 1.000 |
 I/II | 24 (40.0%) | 24 (40.0%) |  |  |
 III | 36 (60.0%) | 36 (60.0%) |  |  |
Differentiation | Â | Â | 1.759 | 0.485 |
 Well | 4 (6.7%) | 4 (6.7%) |  |  |
 Moderately | 50 (83.3%) | 45 (75.0%) |  |  |
 Poor | 6 (10.0%) | 11 (18.3%) |  |  |