id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-353608-de6rrf7v	Saito, Sho	First and second COVID-19 waves in Japan: A comparison of disease severity and characteristics: Comparison of the two COVID-19 waves in Japan	2020-11-02		.txt	text/plain	982	52	55	Mortality (1.2% vs 7.3%) in hospitalized or discharged patients was also lower in the second wave; the same trend was observed on stratification according to age and severity at admission (Table 1 ). Our study showed that the proportion of cases involving severe disease at admission was smaller in the second wave. Data from the second wave indicated a demographic shift toward a younger population with fewer comorbidities, a lower proportion of severe patients at admission, and decreased mortality. However, the mortality was lower in second wave even if stratifying age and severity at admission. The findings of our study indicated that in the first wave, the medical system was under greater strain with more severe cases on admission. In the second wave, patients were younger with fewer underlying diseases and lower mortality rates. Risk factors associated with disease severity and length of hospital stay in COVID-19 patients	./cache/cord-353608-de6rrf7v.txt	./txt/cord-353608-de6rrf7v.txt