Table 3

Risk of acute pancreatitis with respect to average number of cigarettes smoked per day and duration of smoking

	Duration
	<20 Years		≥20 Years
Smoking intensity (cigarettes/day)^*^†	RR^‡ (95% CI)	p Value	RR (95% CI)	p Value
Non-gallstone-related
<10	1.16 (0.75 to 1.79)	0.51	1.50 (1.09 to 2.05)	0.01
≥10	1.46 (0.46 to 4.67)	0.52	2.20 (1.61 to 3.00)	<0.01
Gallstone-related
<10	0.92 (0.58 to 1.46)	0.73	0.90 (0.62 to 1.29)	0.57
≥10	0.50 (0.07 to 3.60)	0.49	0.88 (0.59 to 1.33)	0.55

↵* All the analyses are adjusted for age, gender, body mass index, diabetes, educational level and monthly alcohol consumption.
↵† Never-smokers as reference.
↵‡ Multivariable adjusted rate ratios (RR) and the corresponding 95% CIs.