Table 2:
Calculation of odds ratio of potential risk factors.
Cases
(%)
Controls
(%)
Odds ratio (CI)
NBTC-Lomé* (%)
Blood group A
19 (23,2)
39 (23,8)
OR = 0,97 (IC = 0,49–1,89)
21,1
Blood group B
22 (26,8)
49 (29,9)
OR = 0,86 (IC = 0,46–1,62)
25,6
Blood group AB
2 (2,4)
9 (5,5)
Fisher exact test
†
:
4,7
Blood group O
39 (47,6)
67 (40,9)
OR = 1,31 (IC = 0,74–2,32)
48,6
Rhesus positive
74 (90,2)
153 (93,3)
OR = 0,67 (IC = 0,24–1,9)
91
*NBTC: National Blood Transfusion Centre (mean of years 2006, 2007, 2008).
†
Fisher exact test used for frequencies less than 5.
OR: odds ratio.