| Group: A (n: 300) | Group: B (n: 300) |
| ||
Number of workers | Number of workers with RE | Number of workers | Number of workers with RE | ||
≤2-yr | 27 (9%) | 10 (3.33%) | 25(8.33%) | 5 (1.67%) | The chi-square statistic is 44.9775. The p-value is <0.00001. Significant at p < 0.05. RE: Refractive error |
3-yr | 36 (12%) | 14 (4.67%) | 31(10.33%) | 6 (2%) | |
4-yr | 47 (15.67%) | 20 (6.67%) | 52 (17.33%) | 11(3.67) | |
5-yr | 48 (16%) | 25 (8.33%) | 45 (15%) | 12 (4%) | |
6-yr | 37 (12.33%) | 22 (7.33%) | 41(13.67%) | 12 (4%) | |
7-yr | 35 (11.67%) | 21 (7%) | 30 (10%) | 9 (3%) | |
8-yr | 23 (7.67%) | 14 (4.67%) | 27 (9%) | 8 (2.67) | |
9-yr | 22 (7.33%) | 13 (4.33%) | 30 (10%) | 6 (2%) | |
>10-yr | 25 (8.33%) | 17 (5.67%) | 19 6.33%) | 7 (2.33%) | |
Total | 300 (100%) | 156 (52%) | 300 (100%) | 76 (28.34) |
|