Table 1 Calculating Normal Values of Respiratory Muscle Strength [19]

Male MIP = 120 − (0.41 × age), and male MIP LLN = 62 − (0.15 × age)

Male MEP = 174 − (0.83 × age), male MEP LLN = 117 − (0.83 × age)

Female MIP = 108 − (0.61 × age), and female MIP LLN = 62 − (0.50 × age)

Female MEP = 131 − (0.86 × age), and female MEP LLN = 95 − (0.57 × age)