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. 2020 Jan 30;33(1):1–11. doi: 10.1089/jamp.2019.1556

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© Andrew R. Clark, et al., 2020. Published by Mary Ann Liebert, Inc.

This Open Access article is distributed under the terms of the Creative Commons Attribution Noncommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, distribution, and reproduction in any medium, provided the orginal author(s) and the source are credited.

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FIG. 4. — Device pressure drops generated across five commercial DPIs with a nomogram showing the equivalent inhaler flow rates.^(39,40) (A) In children between 2 and 12 years of age.^(52–60) The letters next to the curves represent the first letter in the name of the device. The two lines labeled as M and F represent theoretical curves based on the equations of Wilson.⁽⁴³⁾ (B) In adults 20–80 years of age.^(61–63) The slope of pressure drop versus age follows the same pattern as MIP with age (Fig. 3).⁽⁴⁰⁾ The letters next to the curves represent lines as delineated in the legend within the graph. Reproduced with permission from Bentham Science. Color images are available online.