Table 2.

The risk factors for severe COVID-19 by binomial logistic regression analysis

	OR	95% CI	p value
Age			0.004
≤40 years
40–60 years	12.28	1.628–92.664	0.015
≥60 years	25.314	3.687–173.783	0.001
Absolute lymphocyte	0.322	0.137–0.756	0.009
count/SD
D-Dimer/SD	17.054	2.547–114.171	0.003

Sex, age, COPD, hypertension, lymphocyte count, platelet count, serum creatinine, blood urea nitrogen, aspartate aminotransferase, serum albumin, C-reactive protein, serum procalcitonin, d-dimer, and B-type natriuretic peptide were used in the logistic regression equation. The result suggests that advanced age, lymphocyte decline, and d-dimer elevation are independent risk factors for patients with severe COVID-19. p value refers to the test results of each variable in logistic regression analysis; p < 0.05 indicates that the variable has an independent correlation with severe COVID-19. Otherwise, there is no independent correlation. The SD of the absolute lymphocyte count is 0.55; the SD of the d-dimer is 3.25.