Table S7. Meta-regression for RR of severe patients vs. non-severe patients.

Variables	No. of reported studies	β coefficient (95% CI)	P value
Mean age	26	–0.0059 (–0.0275 to 0.0158)	0.583
Male	27	0.0053 (–0.0173 to 0.0278)	0.635
Smoking	11	–0.0040 (–0.0124 to 0.0044)	0.312
Hypertension	23	–0.0060 (–0.0165 to 0.0045)	0.249
Diabetes	24	–0.0037 (–0.0090 to 0.0016)	0.165
CVD	20	0.0090 (–0.0367 to 0.0546)	0.685
Cerebrovascular disease	12	0.0135 (–0.0787 to 0.1058)	0.750
Chronic pulmonary disease	18	0.0104 (–0.0585 to 0.0794)	0.752
Chronic kidney disease	14	0.0315 (–0.1087 to 0.1717)	0.633
Liver disease	15	0.0035 (–0.0173 to 0.0242)	0.723
Cancer	18	0.0315 (–0.0890 to 0.1520)	0.587

RR, relative risk; No., number; CI, confidence interval; CVD, cardiovascular disease.