Table 2. Frequencies of MMP1-1607 SNP in patients presenting active and inactive periapical lesions.

	Active (N=40)	Inactive (N=71)	p value
MMP1-1607 genotypes	A (N=40)	I (N=71)	p value*
1G/1G	9 (22.50)	17 (23.94)
1G/2G	17 (42.50)	35 (49.29)	p=1.0000 OR= 1.090 Cl= 0.4032 to 2.947
2G/2G	14 (35.00)	19 (26.76)	p=0.5988 OR=0.7185 Cl=0.2482 to 2.080
1G/2G + 2G/2G	31 (77.50)	54 (76.05)	p=1.0000 OR=0.9222 Cl= 0.3671 to 2.316
MMP1-1607 alleles	C (n=83)	CP (n=142)
1G	38 (45.78)	69 (48.59)
2G	45 (54.21)	73 (51.40	p=0.7821 OR=0.8934 Cl= 0.5190 to 1.538

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