Table 2 Frequency of a CFHR1 deleted allele according to the susceptibility factor and comparison of each subgroup with the control population using a χ² test

	Frequency of CFHR1 deleted allele (%) in each subgroup	χ²	p Value
Total cohort	22.3	12.6	0.0003
No factor identified	18.3	3.04	0.08
CFH mutation	7.9	0.03	0.9
FI mutation	31.8	14.9	0.0001
MCP mutation	2.9	1.25	0.3
C3 mutation	21.9	4.69	0.03
Combined mutations	14.3	0.5	0.5
Anti-FH IgG	92.9	94.7	<0.0001
Cohort without anti-FH IgG cases	16.3	4.8	0.02
Cohort without anti-FH IgG nor FI cases	13.8	2.43	0.12
Control population	8.6	–