No Association between FCγR3B Copy Number Variation and Susceptibility to Biopsy-Proven Giant Cell Arteritis

Table 2

FCGR3B gene copy number distribution in GCA patients and controls. Odds ratios (OR) and 𝑃 values were derived by logistic regression, with the normal diploid copy number (2) selected as the reference category.

FCGR3B copy number	Control 𝑁=162 (%)	GCA 𝑁=138 (%)	OR (95% CI)	𝑃 Value
<2	10 (6.2)	9 (6.5)	1.1 (0.4, 2.8)	0.85
2	139 (85.8)	114 (82.6)	1	—
3+	13 (8.0)	15 (10.8)	1.4 (0.6, 3.1)	0.39

Chi-squared = 0.75, degrees freedom = 2, and 𝑃 value = 0.69.