May 4, 2023 ındgen Q1 2023 Supplemental Financial Information Use of Non-GAAP Financial Measures Inogen has presented certain financial information in accordance with U.S. GAAP and also on a non-GAAP basis for the three months ended March 31, 2023 and March 31, 2022, and for fiscal years ended December 31, 2022, December 31, 2021, and December 31, 2020. Management believes that non-GAAP financial measures, taken in conjunction with U.S. GAAP financial measures, provide useful information for both management ...