| Diagnostic | HLM (n = 59) n (%) | Medina (n = 63) n (%) | Petersen (n = 56) n (%) | Total (n = 178) n (%) | p-value |
| Normal | 13 (22) | 20 (32) | 21 (37) | 54 (30) |
0.04* |
| Asthma | 26 (44) | 18 (28) | 25 (45) | 69 (39) | |
| COPD | 20 (34) | 25 (40) | 10 (18) | 55 (31) |