Odds ratios of melanoma associated with phenotypic features and family history of cancer.

aTotals may vary because of missing values.bAdjusted for age, sex and educational level by unconditional logistic regression analysis. Statistical significance: likelihood ratio test.cI: always burns, never tans; II: often burns, tans minimally; III: rarely burns, tans well; IV: never burns, always tans.dBrothers, sisters, sons, and daughters.