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The h-index, created by Jorge E. Hirsch in 2005, is an attempt to measure the research impact of a scholar. In his 2005 article Hirsch put forward an easily computable index, h, which gives an estimate of the importance, significance, and broad impact of a scientist's cumulative research contributions..
The apnea-hypopnea index (AHI) is an index of severity that combines apneas and hypopneas (slow or shallow breathing). Apnea was defined as cessation of airflow for at least 10 seconds via mouth or nose, whereas hypopnea was defined as at least 50% flow limitation with 3% desaturation.