|
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%)
|
- aSmoking was defined as ever having smoked at least one cigarette every 1–3 days during a 6-month period; bEBV-based risk score were defined by a predefined logistic regression model
