Table 3.

Frequency-dosage measure of aspirin use and odds ratios for pancreatic cancer

Aspirin use	Controls	Cases	OR* (95% CI)	P value
Tablets per month (mean, SD)	13.5 ± 22.1	10.9 ± 18.2	0.990 (0.985-0.996)	0.002
Frequency-dosage measure of aspirin use (counts, %)	n (%)	n (%)
Non-users	270 (27.6)	235 (33.7)	1.00	0.022
Light dose- infrequent use	350 (35.8)	242 (34.7)	0.89 (0.69-1.02)
Heavy dose- infrequent use	123 (12.6)	75 (10.8)	0.74 (0.51-1.08)
Light dose- frequent use	186 (19.0)	120 (17.2)	0.65 (0.47-0.91)
Heavy dose- frequent use	49 (5.0)	25 (3.6)	0.52 (0.28-0.95)

^*adjusted for age, sex, body mass index (continuous), smoking status (never, former, current), pack years of smoking and long standing diabetes mellitus (> 3 years)