Table 1. Frequencies of MMP1-1607 SNP in control subjects and patients presenting periapical lesions.

	Control (N=214)	Lesions (N=111)	p value
N and gender distribution	103 f / 111 m	87 f / 91 m	0.8398*
MMP1-1607 genotypes	C (N=214)	L (N=111)	p value*
1G/1G	75 (35.04)	26 (23.42)
1G/2G	70 (32.71)	52 (46.84)	p=0.0110 OR=2.143 Cl=1.209 to 3.799
2G/2G	69 (32.24)	33 (29.72)	p= 0.3542 OR=1.380 Cl= 0.7501 to 2.537
1G/2G + 2G/2G	139 (64.95)	85 (76.57)	p= 0.0326 OR=1.764 Cl=1.047 to 2.971
MMP1-1607 alleles	C (n=428)	CP (n=222)
1G	220 (51.40)	104 (46.84)
2G	208 (48.59)	118 (53.15)	p= 0.2830 OR=1.200 Cl=0.8673 to 1.661

* chi-square test, **unpaired t test; OR: odds ratio; Cl: confidence interval