Table 3.

Comparing mortality rates between aspirin users (≥ 180 days) and non-users in patients (n = 565) with Stages I and II and III and IV NPC.

AJCC n = 565	Low-Dose Aspirin		X2 Aspirin Non-Users vs. Users	p-Value
	Non-Users n = 452	Users ≥ 180 Days n = 113		Aspirin Non-Users vs. Users	Stages I and II vs. III and IV a
Stages I and II					<0.001 ***
Alive	146 (79.8%)	41 (85.4%)	2.395	0.302
Dead due to NPC	20 (10.9%)	2 (4.2%)
Other Causes of Dead	17 (9.3%)	5 (10.4%)
Stages III and IVa
Alive	139 (51.7%)	55 (84.6%)	23.364	<0.001 ***
Dead due to NPC	96 (35.7%)	7 (10.8%)
Other Causes of Dead	34 (12.6%)	3 (4.6%)

Abbreviation: vs. versus. ^a Stages IVa and IVb only; **** p ≤ 0.001.