Is There an Association between Keloids and Blood Groups?

Table 2

Calculation of odds ratio of potential risk factors.

	Cases; 𝑛 (%)	Controls; 𝑛 (%)	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^†: 𝑃=0.2282	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.