Table S2. Definitions of part of comorbidities.

Comorbidities	Definitions
Coronary heart disease	Coronary heart disease was combined with angina and heart attack
Hypertension	Systolic blood pressure >140 mmHg, diastolic blood pressure >90 mmHg, or the use of antihypertensive medications
Diabetes	Having diabetes or borderline diabetes
Recent acute infectious disease	Having had a head cold, chest cold, diarrhea, flu, pneumonia, or ear infection during the most recent 30 days