Table 2.

Distribution of lifetime smoking variables by intensity of smoking at age 25 in persons diagnosed with chronic pancreatitis

Variable	Category	Smoked <1 PPD (N = 85)	Smoked ≥1 PPD (N = 127)	P-value
		n (%) or median (interquartile range)	n (%) or median (interquartile range)
Age when smoking started (years)		18.0 (15.0-20.0)	16.0 (14.0-18.0)	0.0015
Smoking status at enrollment	Current smoker	54 (63.5)	94 (74.0)	0.1031
	Former smoker	31 (36.5)	33 (26.0)
	Never smoker	0 (0.0)	0 (0.0)
Smoking to alleviate pain		11 (12.9)	15 (11.8)	0.7726
Average # of cigarettes per day during periods of smoking		9.0 (5.0-12.2)	19.3 (16.4-24.7)	<0.0001
Average # of cigarettes per day on a smoking day during periods of smoking		10.0 (8.0-12.9)	19.9 (17.7-26.5)	<0.0001
Smoking duration (years)		30.0 (22.0-37.0)	30.0 (23.0-36.0)	0.9290
Cumulative # of packs smoked until CP diagnosis		4540 (2104-6976)	10440 (6480-14040)	<0.0001
Smoking pack-years until CP diagnosis		13.9 (7.3-20.5)	30.3 (21.0-41.1)	<0.0001

PPD = packs per day