Table 1. The proportion of Cataract surgery in two phases of Shahroud Eye Cohort Study, by different variables .
| Variables | Category | Cataract surgery in first phase of study in 2009 | Cataract surgery in second phase of study in 2014 | ||||
| n | proportion (95% CI) | p | n | proportion (95% CI) | p | ||
| Gender | Male Female |
2151 3039 |
2.4 (1.8-2.9) 1.9 (1.3-2.5) |
0.106 | 1946 2791 |
5.1 (4.2- 5.9) 3.7 (2.8-4.5) |
0.021 |
| Age groups | 40-44 | 966 | 0.4 (0.0-0.8) | <0.001 | - | - | |
| 45-49 | 1379 | 0.8 (0.2- 1.3) | 878 | 1.1 (0.4- 1.8) | <0.001 | ||
| 50-54 | 1288 | 1.4 (0.7- 2.1) | 1277 | 1.5 (0.8- 2.2) | |||
| 55-59 | 950 | 4.1 (2.8- 5.4) | 1186 | 4.0 (2.9- 5.2) | |||
| 60-64 | 607 | 6.9 (4.9- 9.0) | 859 | 8.5 (6.5- 10.4) | |||
| 65-69 | - | - | 537 | 12.0 (9.1- 14.8) | |||
| Having Cataract | Yes (grade>=2) | 137 | 10.2 (4.7- 15.6) | <0.001 | 884 | 7.2 (5.5- 8.9) | <0.001 |
| Diabetes | Yes | 646 | 2.9 (1.7- 4.2) | 0.166 | 1172 | 8.9 (7.2- 10.6) | <0.001 |
| Hypertension | Yes | 1983 | 1.9 (1.3- 2.6) | 0.366 | 2912 | 5.6 (4.8- 6.5) | <0.001 |
| Smoking | Yes | 635 | 2.4 (1.3- 3.6) | 0.643 | 674 | 5.0 (3.1- 7.0) | 0.810 |
| Supplementary Insurance* | Yes | 2072 | 2.1 (1.5- 2.8) | 0.011 | 2650 | 5.2 (4.3- 6.1) | <0.001 |
| Education | Illiterate | 624 | 2.4 (1.6-2.9) | <0.001 | 525 | 4.1 (3.6-5.3) | <0.001 |
| Elementary & Middle school | 2408 | 1.2 (0.9-2.7) | 2202 | 4.3 (3.9-5.7) | |||
| High school & college | 2158 | 3.2 (2.8-6.1) | 1990 | 5.9 (4.1-5.9) | |||
| Economic quintiles | Quintile 1, (low) | 1120 | 1.9 (1.1- 2.7) | <0.001 | 1012 | 2.2 (1.0- 2.8) | <0.001 |
| Quintile 2 | 965 | 2.0 (1.1- 2.9) | 874 | 3.2 (2.0- 4.3) | |||
| Quintile 3 | 1975 | 2.0( 1.3- 2.6) | 983 | 4.6 (3.3- 6.0) | |||
| Quintile 4 | 561 | 2.6 (1.2- 4.0) | 903 | 5.8 (4.4- 7.3) | |||
| Quintile 5, (high) | 546 | 3.3 (1.8- 4.7) | 965 | 7.2 (5.4- 8.9) | |||
CI: Confidence Intervals, * Data were available for 5087