Table 5.

Joint effects among DmtDNA4977 levels, phenotypic index, and history of sun exposure on melanoma risk^*

DmtDNA4977 levels	Low (<0.20)	High (≥0.20)	P for interaction
Phenotypic index
low	1	2.08 (1.10, 3.90)
intermediate	1.47 (0.69, 3.15)	2.22 (1.12, 4.39)
high	2.09 (0.95, 4.60)	2.46 (1.15, 5.27)	0.284
Reported use of Sunlamp
No	1	1.84 (1.09, 3.09)
Yes	3.11 (1.48, 6.51)	4.45 (2.24, 8.82)	0.673
Lifetime sunburn
No	1	1.22 (0.58, 2.60)
Yes	1.83 (0.93, 3.58)	3.56 (1.84, 6.88)	0.314

^*ORs were adjusted by age and gender, skin color, lifetime sunburns, freckling in the sun, and use of sunlamp as appropriate.