Table 2.

Incidence and risk of psoriasis among diabetic patients with NPDR and PDR.

Group	Psoriasis	Person-years	Psoriasis incidence (per 1000 person-years)	Model 1 HR (95% CI)	Model 2 HR (95% CI)	Model 3 HR (95% CI)
Non-DR	38450	9169672.8	4.19	1 (reference)	1 (reference)	1 (reference)
NPDR	4960	933894.42	5.31	1.23 (1.20,1.27)	1.23 (1.19,1.27)	1.26 (1.19,1.34)
PDR	382	66520.76	5.74	1.35 (1.22,1.50)	1.34 (1.21,1.48)	1.35 (1.22,1.50)

CI: confidence interval; DR: diabetic retinopathy; HR: hazard ratio; NPDR: non-proliferative diabetic retinopathy; PDR: proliferative diabetic retinopathy.

Model 1: adjusted for age and gender.

Model 2: adjusted for model 1 + smoking, drinking, regular physical activity, and income level.

Model 3: adjusted for model 2 + body mass index, fasting glucose, hypertension, and dyslipidemia.