Table 2.

Diabetes Duration and Period of Diagnosis of Type 1 Diabetes Models for Visual Impairment.

	Models			Adjusted Models*
Contrast	OR	(95% CI)	P-value	OR	(95% CI)	P-value
Duration of diabetes (years)
10–14 vs 5–9	1.21	(0.54–2.69)	.64	1.11	(0.45–2.79)	.82
15–19 vs 10–14	2.35	(1.33–4.16)	.003	1.10	(0.58–2.10)	.76
20–24 vs 15–19	0.92	(0.62–1.39)	.71	0.69	(0.41–1.14)	.15
25–29 vs 20–24	0.82	(0.56–1.19)	.29	0.76	(0.47–1.22)	.25
30–34 vs 25–29	1.31	(0.90–1.90)	.16	1.21	(0.75–1.94)	.44
35+ vs 30–34	1.17	(0.83–1.65)	.36	1.01	(0.62–1.63)	.98
Duration- ordered factor†	1.15	(1.05–1.26)	.003	0.93	(0.78–1.10)	.40
Period of diagnosis of diabetes
1960–1969 vs 1922–1959	0.44	(0.28–0.68)	<.001	0.42	(0.24–0.71)	.001
1970–1974 vs 1960–1969	0.27	(0.15–0.48)	<.001	0.29	(0.15–0.57)	<.001
1975+ vs 1970–1974	1.46	(0.72–2.98)	.30	1.85	(0.81–4.22)	.15
Period of diagnosis- ordered factor†	0.91	(0.88–0.93)	<.001	0.91	(0.88–0.94)	<.001

Abbreviations: OR=odds ratio; CI=confidence interval.

^*Duration and diagnosis models further adjusted for: age at the examination, gender, glycosylated hemoglobin A1, systolic and diastolic blood pressure, presence of proteinuria, and laser treatment

^†Ordered factor effects were fit using the categorical variable as a linear effect in separate model