Incidence and Time Trends of Type 2 Diabetes Mellitus among Adults in Zhejiang Province, China, 2007-2017

Table 3

Incidence rate ratios (IRR) of type 2 diabetes in relation to calendar year and demographic factors.

Characteristic	Males		Females		All
	IRR	95% CI	IRR	95% CI	IRR	95% CI
Year
2007	Ref.		Ref.		Ref.
2008	1.165	1.137-1.194	1.148	1.122-1.176	1.157	1.137-1.176
2009	1.532	1.497-1.567	1.428	1.397-1.460	1.479	1.455-1.502
2010	1.864	1.823-1.905	1.713	1.677-1.750	1.786	1.758-1.813
2011	2.050	2.007-2.095	1.854	1.816-1.893	1.949	1.920-1.978
2012	2.138	2.094-2.184	1.892	1.853-1.932	2.011	1.981-2.040
2013	2.297	2.249-2.345	1.934	1.895-1.974	2.108	2.077-2.139
2014	2.326	2.278-2.375	1.913	1.874-1.952	2.110	2.080-2.141
2015	2.027	1.988-2.066	1.634	1.604-1.665	1.821	1.797-1.845
2016	1.870	1.835-1.906	1.462	1.434-1.489	1.657	1.635-1.679
2017	1.880	1.844-1.916	1.378	1.353-1.405	1.616	1.594-1.637
Age
20-29 years	0.037	0.036-0.038	0.034	0.033-0.035	0.035	0.035-0.036
30-39 years	0.138	0.136-0.140	0.086	0.085-0.087	0.113	0.112-0.115
40-49 years	0.366	0.362-0.371	0.260	0.256-0.263	0.316	0.313-0.319
50-59 years	0.670	0.662-0.679	0.708	0.700-0.717	0.688	0.682-0.694
60-69 years	0.880	0.869-0.892	1.107	1.094-1.120	0.986	0.977-0.994
70-79 years	0.973	0.960-0.986	1.211	1.196-1.227	1.087	1.077-1.097
≥80 years	Ref.		Ref.		Ref.
Sex
Males					1.083	1.079-1.088
Females					Ref.
Residence area
Urban	1.079	1.072-1.085	0.929	0.923-0.935	1.005	1.001-1.009
Rural	Ref.		Ref.		Ref.

Multivariable Poisson regression model with the calendar year as a dummy variable. IRR: incidence rate ratio; CI: confidence interval; Ref.: reference.