Table 3.
Intergroup t and (P) values for caffeine intake and cataract blindness
| Interzone | Caffeine intake | Cataract blindness |
|---|---|---|
| Between 2 and 1 | 5.02 (0.005) | 1.16 (0.23) |
| Between 3 and 1 | 3.81 (0.0034) | 2.48 (0.03) |
| Between 4 and 1 | 2.54 (0.0293) | 9.04 (0.0001) |
| Between 5 and 1 | 8.35 (0.0001) | 16.77 (0.0001) |
| Between 3 and 2 | 4.16 (0.001) | 2.12 (0.0626) |
| Between 4 and 2 | 2.96 (0.0103) | 8.87 (0.0001) |
| Between 5 and 2 | 10.62 (0.001) | 27.77 (0.001) |
| Between 4 and 3 | 0.662 (0.5527) | 6.05 (0.001) |
| Between 5 and 3 | 6.75 (0.0001) | 16.52 (0.001) |
| Between 5 and 4 | 5.84 (0.001) | 17.33 (0.0001) |
Notes: Data were analyzed for means, standard deviations, and errors by using routine statistical formulas. They were then further analyzed for statistical significance by Student’s t-test. The corresponding P-values were then read from standard t tables. As may be noted, all the P-values showing inhibition of cataract formation with increasing caffeine content were notably significant, except that between the zones 2 and 1.