Table 3.

Population, No. of cancer, Incidence Rate Ratios (IRR) and 95% Confidence Intervals (95% CI) for type of diabetes, treatment (only for type 2 diabetes), and diabetes duration vs subjects without diabetes

	Person-years	N cancer	IRR	95% CI
Without diabetes	1,499,890	9858	1.00	-
With diabetes	85,953	1464	1.22	1.15–1.29
By type of diabetes:
Type 1 diabetes	3017	15	0.88	0.53–1.47
Secondary diabetesa	393	10	2.04	1.10–3.80
Type 2 diabetes	82,542	1439	1.22	1.15–1.29
By treatment:
Diet only	22,900	349	1.10	1.00–1.23
OHAs only	44,637	792	1.22	1.14–1.32
Insulin only	7738	161	1.32	1.13–1.54
OHAs + insulin	7267	137	1.37	1.16–1.62
By diabetes duration (years):
0–1	24,553	361	1.10	0.99–1.23
2–5	24,710	403	1.23	1.11–1.36
6–10	17,033	337	1.44	1.29–1.61
11+	19,658	363	1.15	1.04–1.30

IRR = calculated using Poisson model, adjusted for age, foreign status, and sex. People without diabetes were used as reference. ^adiseases of the exocrine pancreas and drug-induced diabetes