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)
30–39	20	29.9	3	30.0	479	15.0
40–49	17	25.4	2	20.0	463	14.5
50–59	21	31.3	3	30.0	1181	37.1
60–69	9	13.4	2	20.0	1064	33.4
Alcohol consumption
Never	58	86.6	10	–	2611	81.9
Ever	9	13.4	0	–	576	8.1
Cigarette use
Never	64	95.5	10	–	3042	95.5
Ever	3	4.5	0	–	145	4.5