Table 2. Demographic characteristics and the prevalence of corneal blindness.
| Demographic distribution | No. of participants | Blindness in both eyes No. (%) | Blindness in one eye No. (%) | Total No. (%) |
| Gender a | 168673 | |||
| Male | 81564 | 22 (0.027) | 139 (0.170) | 161 (0.197) |
| Female | 87109 | 35 (0.040) | 183 (0.210) | 218 (0.250) |
| Age b | 168651 (No data for 22 persons) | |||
| ≤14 | 20245 | 0 | 0 | 0 |
| 15–59 | 116245 | 9 (0.008) | 70 (0.060) | 79 (0.068) |
| ≥60 | 32161 | 48 (0.149) | 252 (0.784) | 300 (0.933) |
| Education c | 168607 (No data for 66 persons) | |||
| Illiterate | 19563 | 29 (0.148) | 132 (0.675) | 161 (0.823) |
| Primary school | 48989 | 22 (0.045) | 117 (0.239) | 139(0.284) |
| Middle school | 73777 | 6 (0.008) | 62 (0.084) | 68(0.092) |
| University and higher | 26278 | 0 | 11 (0.042) | 11(0.042) |
| Rural vs. urban d | 168673 | |||
| Urban | 74902 | 12 (0.016) | 81 (0.108) | 93(0.124) |
| Rural | 93771 | 45 (0.048) | 241 (0.257) | 286(0.305) |
| Total | 168673 | 57 (0.034) | 322 (0.191) | 379(0.225) |
Comparisons between males and females. Blindness in both eyes, χ2 = 2.18, p = 0.14; blindness in one eye, χ2 = 3.48, p = 0.06; blindness in at least one eye(total), χ2 = 5.25, p = 0.02 (statistically significant difference).
Comparisons between different ages. Blindness in both eyes, χ2 = 131.39, p<0.001 (statistically significant difference); blindness in one eye, χ2 = 608.80, p<0.001 (statistically significant difference); blindness in at least one eye(total), χ2 = 739.70, p <0.001 (statistically significant difference).
Comparisons between different education levels. Blindness in both eyes, χ2 = 100.87, p<0.001 (statistically significant difference); blindness in one eye, χ2 = 321.00, p<0.001 (statistically significant difference); blindness in at least one eye(total), χ2 = 416.79, p≤0.001 (statistically significant difference).
Comparisons between rural and urban areas. Blindness in both eyes, χ2 = 12.60, p<0.001 (statistically significant difference); blindness in one eye, χ2 = 48.43, p<0.001 (statistically significant difference); blindness in at least one eye(total), χ2 = 60.74, p<0.001 (statistically significant difference).