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Correlation of age vs hardness of the nucleus
| Age group | 1 Soft | 2 Medium | 3 Hard | Total |
|---|---|---|---|---|
| < 40 yrs. | 18 | 0 | 0 | 18 |
| 41-50 yrs. | 59 | 18 | 0 | 77 |
| 51-60 yrs. | 43 | 97 | 3 | 143 |
| 61-70 yrs. | 25 | 59 | 46 | 130 |
| > 71 yrs. | 4 | 6 | 51 | 61 |
Chi Square 289.9; Since the number was very low including; 0 at places it was not amenable for statistical analysis
