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Table 1 Seroprevalence and putative characteristics related to SARS-CoV-2 infection among blood donors from Luanda, Angola

From: Seroprevalence of anti-SARS-CoV-2 antibodies and risk factors among healthy blood donors in Luanda, Angola

Independent variables N (%) Anti-SARS-CoV-2 positivity Past infection Recent infection Univariate analysis
   No (%) Yes (%) p-value* No (%) Yes (%) p-value* No (%) Yes (%) p-value* OR (95% CI) p-value
Overall 343 (100) 327 (95.3) 16 (4.7)   332 (96.8) 11 (3.2)   338 (98.5) 5 (1.5)    
Age groups             
< 20y 7 (2.0) 6 (85.7) 1 (14.3) 0.443 6 (85.7) 1 (14.3) 0.206 7 (100) 0 (0.0) 0.933 4.58 (0.36–58.4) 0.241
20–40y 279 (81.3) 266 (95.3) 13 (4.7)   270 (96.8) 9 (3.2)   275 (98.6) 4 (1.1)   1.34 (0.30–6.13) 0.402
> 40y 57 (16.6) 55 (96.5) 2 (3.5)   56 (98.2) 1 (1.8)   56 (98.2) 1 (1.8)   1.00
Gender             
Female 24 (7.0) 24 (100) 0 (0.0) 0.261 24 (100) 0 (0.0) 0.355 24 (100) 0 (0.0) 0.537 0 (0.0–0.0) 0.998
Male 319 (93.0) 303 (95.0) 16 (5.0)   308 (96.6) 11 (3.4)   314 (98.4) 5 (1.6)   1.00
Residence area             
Rural 214 (62.4) 202 (94.4) 12 (5.6) 0.286 206 (96.3) 8 (3.7) 0.472 210 (98.1) 4 (1.9) 0.413 1.86 (0.59–5.88) 0.293
Urban 129 (37.6) 125 (96.9) 4 (3.1)   126 (97.7) 3 (2.3)   128 (99.2) 1 (0.8)   1.00
Educational level #             
Low 59 (23.2) 53 (89.8) 6 (10.2) 0.163 57 (96.6) 2 (3.4) 0.685 55 (93.2) 4 (6.8) 0.002 1.00
High 195 (76.8) 185 (94.9) 10 (5.1)   186 (95.4) 9 (4.6)   194 (99.5) 1 (0.5)   0.48 (0.17–1.37) 0.171
Occupation             
Unemployed 26 (7.6) 24 (92.3) 2 (7.7) 0.446 24 (92.3) 2 (7.7) 0.177 26 (100) 0 (0.0) 0.519 1.00
Employed 317 (92.4) 303 (95.6) 14 (4.4)   308 (97.2) 9 (2.8)   312 (98.4) 5 (1.6)   0.55 (0.12–2.58) 0.453
Donor category             
Voluntary 49 (14.3) 48 (98.0) 1 (2.0) 0.347 49 (100) 0 (0.0) 0.169 48 (98.0) 1 (2.0) 0.713 0.39 (0.05–3.00) 0.364
Family 294 (85.7) 279 (94.9) 15 (5.1)   283 (96.3) 11 (3.7)   290 (98.6) 4 (1.4)   1.00
  1. Past infection (IgG+/IgM−) and Recent infection (IgG−/IgM+ or IgG+/IgM+)
  2. The bold number was statistically significant (p < 0.05)
  3. *Chi-square test (X2)
  4. #Missing values: 89