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. 2023 May;29(5):1002–1006. doi: 10.3201/eid2905.221787

Table. Demographics of study participants for spatiotemporal evolution of SARS-CoV-2 Alpha and Delta variants during large nationwide outbreak of COVID-19, Vietnam, 2021*.

Characteristic No. sequences, n = 1,303 Alpha, n = 74 AY.57, n = 1,212
Age, y
Median (Q1‒Q3) 43 (29‒61) 35 (30–55) 44 (29‒61)
Missing
38 (2.9)
31 (41.9)
2 (0.2)
Sex
M 689 (52.9) 22 (29.7) 661 (54.5)
F 578 (44.4) 21 (28.4) 551 (45.5)
Unknown
36 (2.8)
31 (41.9)

Region
Central 120 (9.2) 24 (32.4) 94 (7.8)
Northern 504 (38.7) 44 (59.5) 450 (37.1)
Southern 679 (52.1) 6 (8.1) 668 (55.1)

*Values are no. (%) unless indicated otherwise. Characteristics of A.23.1 variant‒infected cases were previously reported (7). Q, quartile.