There was also a decreasing trend of severity of disease as reflected by lower NIV use (after year 2010) and lower mortality rate due to COPD.
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Hospital Burden of Chronic Obstructive Pulmonary Disease in Hong Kong - The Trend from 2006 to 2014.
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The sentences
We observed an increasing trend of mortality due to pneumonia in COPD patients.
It appeared that the air quality of HK showed some, though may not be significant, improvement over the study period.
The HC with the first admission in 2007 (defined as 2007 cohort) and the subsequent years (2008 to 2014 cohorts) showed a trend of reducing numbers over the years.