Table 1

 Characteristics of all subjects at baseline

NPC (n = 67)Sinonasal cancer (n = 10)Non-cases subcohort (n = 3187)
n%n%n%
Age (years)
    30–392029.9330.047915.0
    40–491725.4220.046314.5
    50–592131.3330.0118137.1
    60–69913.4220.0106433.4
Alcohol consumption
    Never5886.610261181.9
    Ever913.405768.1
Cigarette use
    Never6495.510304295.5
    Ever34.501454.5