Cigarette smoking associated with chronic pancreatitis: a case control study in China

Table 3 Likelihood of chronic pancreatitis with respect to gender, biliary disease stratified by smoking duration (in years) in a retrospective case control study

Variable	Smoking duration	OR	95.0% CI		P value
Variable	(years)		Lower	Upper
All subjects
	20–29	0.685	0.454	1.034	0.072
	≥ 30	1.372	0.842	2.237	0.204
All subjects without biliary disease
	20–29	0.742	0.436	1.264	0.272
	≥ 30	2.345	1.106	4.973	0.026*
Male
	20–29	0.655	0.405	1.06	0.085
	≥ 30	1.32	0.723	2.412	0.366

Age- and gender-matched healthy individuals were randomly selected from the PUMCH Medical Center as control group

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