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Table 1 Participant demographics and site characteristics

From: SARS-CoV-2 exposure in Malawian blood donors: an analysis of seroprevalence and variant dynamics between January 2020 and July 2021

  Balaka Blantyre Lilongwe Mzuzu Overall
Region Eastern Southern Central Northern
Rural/urban Rural Urban Urban Urban
Pop density (persons/km2)j 205 3334 2455 1516
Sampling frame All locations Static Static Static
Gender, % male (N) 68.9% (825) 77.6% (1049) 64.5% (856) 79.6% (962) 72.6% (3692)
Age, median (IQR) 20.8 (19.7–24.9) 26.9 (21.9–34.1) 30.1 (23.8–37.9) 24.6 (20.2–31.6) 25.0 (20.7–33.2)
Sample size 1198 1351 1328 1208 5085
  1. IQR interquartile range, km kilometre
  2. jSource: 2018 Malawi Population and Housing Census main report