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Percentage of responded and non-responded subjects among groups
| Group I | Group II | Group III | Group IV | |
| Responded | 80 (80.0%) | 520 (86.7%) | 10 (83.3%) | 15 (60.0%) |
| Non-Responded | 20 (20.0%) | 80 (13.3%) | 2 (16.7%) | 10 (40.0%) |
| Total | 100 (100.0%) | 600 (100.0%) | 12 (100.0%) | 25 (100.0%) |
