TABLE 4.

Univariate and multivariate Cox regression analyses of factors associated with time to N gene subgenomic RNA RT-PCR negativity

Characteristic	Univariate model			Multivariate model
	HR	95% CI	P value	HR	95% CI	P value
Age >40 yrs	0.37	0.17–0.80	0.012	0.46	0.21–1.01	0.054
Female	2.53	1.01–6.38	0.049	1.82	0.69–4.79	0.224
BMI >27.5 (kg/m2)	0.58	0.27–1.26	0.171
Pneumonia	0.40	0.16–0.99	0.049
Favipiravir	0.49	0.24–1.01	0.056
Steroid	0.19	0.06–0.66	0.009	0.28	0.08–0.99	0.048
2-dose vaccination	2.13	0.92–4.93	0.076
Virus strain
Alpha	1.15	0.32–4.20	0.830
Delta	2.19	0.58–8.23	0.245