|
Variable
|
Category
|
Sample size
|
Seropositive (frequency)
|
Unadjusted (%)
|
Estimate
|
SE
|
z value
|
p value
|
|---|
|
Intercept
| | | | |
− 6.12
|
0.76
|
− 8.11
|
< 0.001
|
|
Gender
|
Female
|
1393
|
407
|
29.2%
|
Ref
|
Ref
|
Ref
|
Ref
|
|
Male
|
3692
|
994
|
26.9%
|
0.05
|
0.09
|
0.58
|
0.56
|
|
Age group
|
15–19§
|
912
|
265
|
29.1%
|
Ref
|
Ref
|
Ref
|
Ref
|
|
20–29
|
2465
|
684
|
27.7%
|
− 0.04
|
0.11
|
− 0.32
|
0.75
|
|
30–39
|
1068
|
284
|
26.6%
|
− 0.01
|
0.13
|
− 0.06
|
0.95
|
|
40–49
|
596
|
154
|
25.8%
|
0.16
|
0.15
|
1.04
|
0.3
|
|
50+
|
44
|
14
|
31.8%
|
0.2
|
0.38
|
0.53
|
0.6
|
|
Location
|
Balakaφ
|
1198
|
254
|
21.2%
|
Ref
|
Ref
|
Ref
|
Ref
|
|
Blantyre
|
1351
|
416
|
30.8%
|
0.77
|
0.13
|
5.92
|
< 0.001*
|
|
Lilongwe
|
1328
|
345
|
26.0%
|
0.6
|
0.13
|
4.56
|
< 0.001*
|
|
Mzuzu
|
1208
|
386
|
32.0%
|
0.86
|
0.13
|
6.41
|
< 0.001*
|
- This is an unweighted multivariable logistic regression model with sex, age group, location, and time as predictors
- §Recruitment limited to blood donors ≥15 years of age
- *Significant based on p value < 0.05
- φBalaka was used as a reference as it is the only Malawi Blood Transfusion Service (MBTS) static site that directly covers the rural area
