Table 2 . Multivariate odds ratio (95% CI) for never visiting an eye care provider in different logistic regression models, Shahroud, Iran, 2009 .

Independent variables		Adjusted odds ratio (95% CI)
		Model 1 a	Model 2 b	Model 3 c	Model 4 d
Predisposing variables	Age (year)		0.95 (0.94–0.96)		0.94 (0.93–0.96)
	Education (year)		0.91 (0.89–0.93)		0.94 (0.92–0.96)
	Gender
	Men		1		1
	Women		1.80 (1.51–2.13)		1.79 (1.51–2.14)
Enabling variables	Economic Status
	High			1	1
	Moderate			1.97 (1.62–2.39)	1.81 (1.48–2.21)
	Low			2.74 (2.24–3.36	2.33 (1.90–2.87)
	Insurance Status
	Insured			1	1
	Not Insured			2.14 (1.62–2.83)	1.93 (1.45–2.58)
Need variable	Presenting vision
	≤0.30 LogMAR	1	1	1	1
	>0.30 LogMAR	1.67 (1.28–2.17)	1.59 (1.21–2.11)	1.31 (0.99–1.73)	1.41 (1.05–1.90)

CI= Confidence Interval; a= Include only need variable as an Univariate model; b= Include need and predisposing variables; c= Include need and enabling variables d= Include need, predisposing and enabling variables.