Table 4 Genotypic and allelic distribution of NFκB1 insertion or deletion in patients with rheumatoid arthritis and in controls.

	n	Del/del	Del/ins	Ins/ins	Alleles	Del	Ins
Controls from Madrid	458	74 (16)	214 (47)	168 (37)	916	362 (40)	554 (60)
Controls from Granada	247	35 (14)	107 (43)	105 (43)	494	177 (36)	317 (64)
Patients from Madrid	376	61 (16)	168 (45)	147 (39)	752	290 (39)	462 (61)
Patients from Granada	245	28 (11)	124 (51)	93 (38)	490	180 (37)	310 (63)

del, deletions; ins, insertions; NFκB1, nuclear factor κB1; RA, rheumatoid arthritis.

Values in parentheses are percentages.

Overall genotype comparison (Madrid and Granada), p = 0.80.

Minimum detectable allelic RR = 1.25.