Chronic medical illness, (%) Included in the Meta-analysis Estimate (95% CI) Included in the Meta-analysis Estimate (95% CI)
Non-severe severe
Respiratory system disease 0.01(0.00,0.04) 0.04(0.02,0.08)
Cardiovascular disease 0.02(0.01,0.03) 0.08(0.04,0.15)
Malignant tumour 0.01(0.00,0.04) 0.03(0.01,0.06)
Digestive system disease 0.05(0.02,0.13) 0.03(0.00,0.19)
Endocrine system disease 0.06(0.05,0.08) 0.16(0.11,0.21)
Hypertension 0.17(0.011,0.25) 0.29(0.20,0.39)
Overall 0.04(0.02,0.08) 0.08(0.04,0.14)