Table 2.

Comparison of genotype frequencies according to the rs 61722009 variant of the NOS3 gene.

Gene	Genotype, allele	COVID-19 patients (n = 117)	Comparison group (n = 102)	Results of statistical analysis
NOS3 rs61722009	4bb	71 (60.7%)	88 (86.3%)	χ2 = 17.94, p = 0.00001, OR = 0.25 (0.13–0.48)
	4ba	38 (32.5%)	12 (11.8%)	χ2 = 13.27, p = 0.0003, OR = 3.61 (1.76–7.38)
	4aa	8 (6.8%)	2 (2.0%)	p > 0.05
	4b	0.77	0.92	χ2 = 18.84, p = 0.00001, OR = 0.28 (0.16–0.51)
	4a	0.23	0.08	χ2 = 18.84, p = 0.00001, OR = 3.53 (1.95–6.39)