Table 2 Characteristics of the participants
Variables | Cases n (%) | Controls n (%) | p-value |
|---|---|---|---|
Gender | Â | Â | Â |
Male | 151(75.30) | 145(72.50) | 0.494 |
Female | 49(24.70) | 55(27.50) | Â |
Age, years | Â | Â | Â |
Mean (SD) | 51.09(9.52) | 49.83(9.67) | 0.378 |
≤ 50 | 84((42.00) | 93(46.50) | 0.365 |
> 50 | 116(58.00) | 107(53.50) |  |
EBV-DNA | Â | Â | Â |
positive | 161(80.50) | 9(4.50) | < 0.001 |
negative | 39(19.50) | 191(95.50) | Â |
Nationality | Â | Â | Â |
Han | 108(54.00) | 120(60.00) | 0.226 |
Zhuang | 92(46.00) | 80(40.00) | Â |
Smoking status | Â | Â | Â |
Smoker | 54(27.00) | 41(20.50) | 0.127 |
Nonsmoker | 146(73.00) | 159(79.50) | Â |
Drinking status | Â | Â | Â |
Drinker | 79((39.50) | 67(33.50) | 0.213 |
Nondrinker | 121(60.50) | 133(66.50) | Â |
Clinical stage | Â | Â | Â |
I + II | 102(51.00) | NA | NA |
III + IV | 98(49.00) | NA |  |
Local tumor invasion | Â | Â | Â |
T1 + T2 | 128(64.00) | NA | NA |
T3 + T4 | 72(36.00) | NA |  |
Lymph node involvement | Â | Â | Â |
N0 + N1 | 134(67.00) | NA | NA |
N2 + N3 | 66(33.00) | NA |  |
Distant metastasis | Â | Â | Â |
Yes | 23(11.50) | NA | NA |
No | 177(88.50) | NA | Â |