Fig. 1: Odds ratios for presenting (first row) and pinhole (second row) visual impairment and blindness for different SES groupings.

Individuals were grouped into A even SES terciles with imputed data, B SES terciles using original data, C uneven thirds (i.e., 20% in the highest and 40% in the middle and bottom groups) using imputed data, and D even quintiles (i.e., 20% in each group) using imputed data. Odd ratios were calculated relative to the lowest tercile. Vertical lines represent 95% confidence intervals and the dashed horizontal line represents an odds ratio of 1.