Table 2.

Incidence of acute pancreatitis associated with type 2 diabetes stratified by age and sex from a retrospective claims database study, 2000–2005

	Nondiabetic cohort				Type 2 diabetic cohort				IRR: type 2 diabetic cohort vs. nondiabetic cohort (95% CI)
	n *	Incident cases	Person-years of follow-up	Incidence rate per 100,000 person-years (95% CI)	n	Incident cases	Person-years of follow-up	Incidence rate per 100,000 person-years (95% CI)
Overall age	336,410	827	553,959.28	149.29 (139.11–159.46)	334,930	2,551	604,684.35	421.87 (405.50–438.24)	2.83 (2.61–3.06)
18–30 years	13,628	9	17,029.62	52.85 (18.32–87.38)	13,553	81	19,780.12	409.50 (320.32–498.68)	7.75 (3.89–15.43)
31–44 years	78,518	105	120,783.10	86.93 (70.30–103.56)	78,051	584	132,996.11	439.11 (403.50–474.72)	5.05 (4.10–6.22)
45–54 years	120,354	272	200,359.38	135.76 (119.62–151.89)	119,823	862	217,352.86	396.59 (370.11–423.07)	2.92 (2.55–3.35)
55–64 years	91,859	273	154,084.70	177.18 (156.16–198.19)	91,526	723	167,069.73	432.75 (401.21–464.30)	2.44 (2.13–2.81)
≥65 years	32,051	168	61,702.48	272.27 (231.10–313.45)	31,977	301	67,485.52	446.02 (395.63–496.41)	1.64 (1.36–1.98)
Sex
Female	148,868	370	242,728.54	152.43 (136.90–167.97)	148,288	1058	267,658.93	395.28 (371.46–419.10)	2.59 (2.30–2.92)
Male	187,542	457	311,230.74	146.84 (133.37–160.30)	186,642	1493	337,025.42	442.99 (420.52–465.46)	3.02 (2.72–3.35)

*Patients with events of acute pancreatitis (n = 594 from the nondiabetic cohort and n = 1,883 from the type 2 diabetic cohort) or chronic pancreatitis (n = 162 from the nondiabetic cohort and n = 656 from the type 2 diabetic cohort) during the 1-year baseline period were excluded from the numerator and the denominator. In addition, patients with chronic pancreatitis during follow-up were excluded (n = 26 from the nondiabetic cohort and n = 161 from the type 2 diabetic cohort). Note that some patients may have had more than one exclusionary event.