Table 4.

Risk of melanoma as estimated by DmtDNA4977 levels.

DmtDNA4977 levels	Number of cases (%)	Number of controls (%)	OR (95% CI)*
Continuous variable	219 (100)	206 (100)	1.23 (1.01, 1.50)
Categorical variable
By mean in controls
<0.20	81 (39.3)	110 (50.2)	1.00
≥0.20	125 (60.7)	109 (49.8)	1.67 (1.09, 2.54)
By quartile in controls
1st	36 (17.5)	55 (25.1)	1.00
2nd	45 (21.8)	55 (25.1)	1.25 (0.65, 2.37)
3rd	58 (28.2)	56 (25.6)	1.60 (0.87, 2.92)
4th	67 (32.5)	53 (24.2)	2.16 (1.18, 3.97)
			P for trend = 0.001

^*ORs were adjusted by age, gender, hair color, skin color, eye color, tanning ability, lifetime sunburns, freckling in the sun, and use of sunlamp