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. Author manuscript; available in PMC: 2013 Apr 4.
Published in final edited form as: Respir Care. 2009 Oct;54(10):1321–1328.

Table 5.

Gender-specific MIP reference equations

coefficient age age2 wt wt2 age*wt ht ht2 LLN R2
men = +9.8 −0.31 0 1.47 −.0026 −.0059 0 0 40 0.27
women = −388 1.77 −.0014 0.41 0 −.0041 4.69 −.014 36 0.21

Footnotes: MIP in cmH2O; weight in pounds; height in centimeters

To obtain the lower limit of the normal range (LLN) for men, subtract 40 from the predicted MIP (subtract 36 for women).