Characteristics of study subjects
| Cell phone group | Control group | p-value | |
| Subjects n | 24 | 24 | |
| Age yrs | 71.4±1.7 | 72.8±1.3 | 0.741 |
| Males | 24 (100) | 24 (100) | 1.000 |
| Body mass index | 22.9±0.7 | 23.5±0.7 | 0.773 |
| SF-12 PCS | 38.7±1.8 | 40.1±1.3 | 0.959 |
| ISWT m | 255.8±20.6 | 262.9±16.5 | 0.464 |
| FVC L | 1.87±0.07 | 2.00±0.13 | 0.718 |
| FEV1 L | 0.97±0.06 | 0.99±0.06 | 0.951 |
| FEV1 % pred | 45.2±3.2 | 46.0±2.8 | 0.918 |
| FEV1/FVC% | 51.8±2.8 | 50.8±2.4 | 0.650 |
| IC pre-ISWT L | 1.59±0.06 | 1.69±0.12 | 0.789 |
| IC post-ISWT L | 1.30±0.06 | 1.37±0.11 | 0.934 |
| Change in IC | 0.29±0.02 | 0.32±0.03 | 0.322 |
Data are presented as mean±SEM or n (%), unless otherwise stated. SF-12: Short Form-12 Health Survey; PCS: physical component summary scores; ISWT: incremental shuttle walk test; FVC: forced vital capacity; FEV1: forced expiratory volume in one second; % pred: % predicted; IC: inspiratory capacity.