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Normal reference ranges expressed as the lower limit of normal

Normal reference ranges expressed as the lower limit of normal
Male MIP reference =
  • 120 – (0.41 × age)
 Male MIP LLN =
  • 62 – (0.15 × age)
Male MEP reference =
  • 174 – (0.83 × age)
 Male MEP LLN =
  • 117 – (0.83 × age)
Female MIP reference =
  • 108 – (0.61 × age)
 Female MIP LLN =
  • 62 – (0.50 × age)
Female MEP reference =
  • 131 – (0.86 × age)
 Female MEP LLN =
  • 95 – (0.57 × age)
MIP: maximal inspiratory pressure; LLN: lower limit of normal; MEP: maximal expiratory pressure.
Reproduced with permission of the American Association for Respiratory Care, from: Evans JA, Whitelaw WA. The assessment of maximal respiratory mouth pressures in adults. Respir Care 2009; 54:1348; permission conveyed through Copyright Clearance Center, Inc. Copyright © 2009.
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