Table 1 Baseline characteristics of enrolled participants
Variables | n(%) | |
|---|---|---|
Sex, n (%) | male | 649 (47.62%) |
female | 714 (52.38%) | |
Age, n (%) | Median age, years (IQR) | 49 (43 ~ 57) |
30–39 | 216 (15.85%) | |
40–49 | 472 (34.63%) | |
50–59 | 461 (33.82%) | |
60–69 | 214 (15.70%) | |
Smoking, n (%)a | never | 799 (58.62%) |
current or former | 564 (41.38%) | |
Salted food, n (%) | monthly or less | 1171 (85.91%) |
weekly and more | 192 (14.09%) | |
Family history of NPC, n (%) | no | 1302 (95.52%) |
yes | 61 (4.48%) | |
Education, n (%) | ≤6 year | 488 (35.8%) |
> 6 year | 875 (64.2%) | |
EBV-based risk score, n (%)b | 0.65 - < 0.98 | 966 (70.87%) |
≥0.98 | 397 (29.13%) |