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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