Table 1.

Characteristics of eligible studies.

Study	No. of asymptomatic cases included in the beginning	Type of imaging (CT or radiograph)	Remained asymptomatic or developed symptoms or undetermined course	No. of cases that remained asymptomatic-developed symptoms-undetermined course	No. of cases with positive findings	Findings (n)	Lung findings distribution (n)
An et al., 202016	25	CT	Remained asymptomatic	16	24 (undetermined which case did not have imaging findings)	GGO alone (16), GGO + consolidation shadow (5), GGO + stripe shadow (2), GGO + interlobular septal thickening (1)	Single lobe (16), Two lobes (4), >2 lobes (4) Bilateral (6) Peripheral (18)
			Developed symptoms	9
He et al., 202017	12	CT	Remained asymptomatic	12	5	GGO (5)	Bilateral (4)
Hu et al., 202018	24	CT	Remained asymptomatic	19	12	GGO (8), Stripe shadow (4)	NA
			Developed symptoms	5	5	GGO (4), Stripe shadow (1)	NA
Inui et al., 202019	76	CT	Undetermined	76	41	GGO alone (17), GGO + intra/inter-lobular septal thickening (7), GGO + consolidation (17)	Single lobe (10), Two lobes (12), >2 lobes (19) RLL (29), LLL (29) Bilateral (34) Peripheral (24)
Wang et al., 202020	55	CT	Remained asymptomatic	16	37 (undetermined which case did not have imaging findings)	Pneumonia (39)	NA
			Developed symptoms	39
Zhou X et al., 20205	13	CT	Remained asymptomatic	10	9	GGO (12)	NA
			Developed symptoms	3	3
Zhou J et al., 202021	26	CT	Remained asymptomatic	17	5 (undetermined which case did not have imaging findings)	GGO (5)	Peripheral (5)
			Developed symptoms	9

CT, computed tomography; GGO, ground glass opacity; NA, not applicable; RLL, right lower lobe; LLL, left lower lobe.