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Table 6 Impact of donor age on prevalence of TTIs

From: Trends and epidemiological analysis of hepatitis B virus, hepatitis C virus, human immunodeficiency virus, and human T-cell lymphotropic virus among Iranian blood donors: strategies for improving blood safety

Male Female
Donation Number Age
(Year)
Number of confirmed positive samples
Prevalence /100000 donation (95% CI)
Donation Number Age
(Year)
Number of confirmed positive samples
Prevalence /100000 donation (95% CI)
HBV HIV HCV HTLV 1/2 HBV HIV HCV HTLV 1/2
3,436,921 < 29 1236
36 (32.4–39.9)
24
0.7 (0.4–1.4)
215
6.3 (4.9–8)
505
14.7 (12.5–17.2)
185,939 < 29 78
41.9 (38–46)
3
1.6 (1–2.6)
11
5.9 (4.5–7.6)
61
32.8 (29.4–36.5)
P value 0.2 0.2 0.2 0.0001      
aChi-square
Pearson value
1.7 1.9 1.7 37.1      
30–39 1894
55.1 (50.6–59.8)
41
1.2 (0.7–2.1)
553
16.1 (13.7–18.7)
716
20.8 (18.2–23.8)
30–39 113
60.8 (56.1–65.8)
1
0.5 (0.2–1.2)
13
7 (5.5–8.8)
112
60.2 (55.6–65.2)
P value 0.1 0.7 0.002 0.0001      
Chi-square
Pearson value
1.02 0.6 9.3 119.8      
40–49 1538
44.7 (40.7–49)
10
0.3 (0.1–0.8)
292
8.5 (6.8–10.5)
609
17.7 (15.2–20.5)
40–49 125
67.2 (62.3–72.4)
2
1.1 (0.6–1.9)
15
8.1 (6.5–10)
158
85 (79.4–90.9)
P value 0.0001 0.1 0.9 0.0001      
Chi-square
Pearson value
19.4 3.3 0.03 376.9      
> 50 938
27.3 (24.2–30.7)
6
0.2 (0.05–0.7)
139
4 (2.9–5.4)
385
11.2 (9.7–14)
> 50 88
47.3 (43.2–51.7)
1
0.5 (0.2–1.2)
14
7.5 (5.6–9.4)
116
62.4 (57.7–67.5)
  P value 0.0001 0.3 0.0001 0.0001       
  Chi-square
Pearson value
25.1 1.2 45.2 334.2       
  1. aFor each chi-square comparison, the degrees of freedom is 1