Diagnosis of patients studied
| Diagnosis | No. |
| Total | 79 |
| Neuromuscular | |
| Poliomyelitis | 45 |
| Duchenne's muscular dystrophy | 15 |
| Other myopathy | 4 |
| Motor neurone disease | |
| Amyotrophic lateral sclerosis | 2 |
| Spinal muscular atrophy | 2 |
| Multiple sclerosis | 3 |
| Peripheral neuropathy | 2 |
| Chest wall disorders | |
| Kyphoscoliosis | 5 |
| Thoracoplasty for tuberculosis | 1 |