Normal values and lower limits of normal for maximal respiratory pressures according to sex
| MRP | Girls (n = 84) | Boys (n = 98) |
| MIP (cmH2O) | 75.3±22 | 86.8±24.94 |
| MEP (cmH2O) | 104.65±26.8 | 121.1±30 |
| LLN MIP (cmH2O) | 30.91 | 36.98 |
| LLN MEP (cmH2O) | 50.91 | 61.84 |
MRP: maximal respiratory pressures; MIP: maximal inspiratory pressure; MEP: maximal expiratory pressure; cmH2O: centimeters of water; LLN: lower limits of normal