| Groups | Total | |||||
| Group I | Group II | Group III | ||||
| Range of age | 25 - 35 ys |
| 12 (20%) | 17 (28%) | 11 (19%) | 40 (23%) |
| 36 - 45 ys |
| 27 (45%) | 31 (52%) | 29 (48%) | 87 (48%) | |
| 46 - 55 ys |
| 21 (35%) | 12 (20%) | 20 (33%) | 53 (29%) | |
| Total | 60 (100%) | 60 (100%) | 60 (100%) | 180 (100%) | ||
| Chi-square | X2 | 4.725 | ||||
| P-value | 0.146 | |||||