Table 4.

Generalized Estimating Equation Models of Age, Sex, and Region Rate Ratios of Blindness and Moderate to Severe Visual Impairment Resulting from Trachomatous Corneal Opacity

Variable	Blindness			Moderate to Severe Visual Impairment
	Rate Ratio Estimate	95% Confidence Interval	P Value	Rate Ratio Estimate	95% Confidence Interval	P Value
Increase with each 10 yrs in age	2.39	1.83–3.12	< 0.0001	1.88	1.63–2.16	< 0.0001
Female vs. male sex	3.52	2.22–5.56	< 0.0001	2.47	1.54–3.94	0.0002
Sub-Saharan Africa plus North Africa and Middle East vs all other regions	14.37	6.29–32.79	< 0.0001	8.48	3.54–20.33	< 0.0001