The investigators hypothesize that early mobility condition and muscle power may be the predictive factors for Coronavirus disease 2019(COVID-19) patients' activity prognosis and hospitalization days. To prove our hypothesis, the investigators proposed a retrospective cohort study to see if ICU mobility scale(ICUMS) and Medical Research Council Sum Score(MRCSS) can predicted the patients' Barthel index after discharge and hospitalization days.

The investigators hypothesize that early mobility condition and muscle power may be the predictive factors for COVID-19 patients' activity prognosis and hospitalization days. To prove our hypothesis, the investigators checked the patient's baseline ICUMS and MRCSS upon admission. Also, blood test results were also obtained. Subsequently, the investigators measured their outcomes by Barthel index and hospitalization length, and divided them into two groups. The ICUMS, MRCSS and the blood test results differences between two groups were checked. For those factors that showed significant difference between two groups, the investigators recruited them into regression model. Last, receiver operating curve of those factors were plotted to find the appropriate cutoff points for identifying two groups of outcomes.

Inclusion Criteria:

• COVID-19 patients diagnosed by positive polymerase chain reaction(PCR)

Exclusion Criteria:

• Impaired baseline activities, such as stroke, fracture, neurodegenerative disease
• Baseline Barthel index score less than 100
• Lost follow-up

COVID-19 patients admitted at Taichung VGH from 2020/1/1 to 2021/6/15