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Table 1 Baseline characteristics of enrolled participants

From: Plasma Epstein-Barr virus DNA and risk of nasopharyngeal carcinoma in a prospective seropositive population

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%)
  1. 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