Table 2.

Semi-quantitative risk schedule

Scale	Descriptor	Definition	Example (see Online Supplemental information for full descriptions)
Level 1	Minimal Risk	Participant and staff are not in close contact at anytime. No aerosolizing procedures. No processing of biologic samples.	Data collection by phone, in-person survey administration, fuel delivery
Level 2	Moderate Risk	Participant and staff may be in close contact but only for a short period of time. Biologic materials may be processed in the lab. No aerosolizing procedures performed.	Brachial artery reactivity testing, carotid artery reactivity testing, blood pressure measurement, fetal ultrasound, personal exposure assessment in adults, blood collection in adults, urine collection in adults
Level 3	High Risk	Participant and staff may be in close contact for a prolonged period of time or an aerosolizing procedure is occuring	Anthropometry, collection of blood in children, screening children for pneumonia, lung ultrasound, buccal scrape, nasal brush
Level 4	Unnaceptable Risk for Research	Participant and staff may be in close contact with patient samples for a prolonged period of time and an aerosolizing procedure is occuring in a manner that staff and participants can not be safely protected.	Bronchoscopy, Induced sputum, Cardiopulmonary resuscitation (CPR)