Table 1.

Phenotypic and UV Radiation Behavior Among Cases (by Age Range at Diagnosis) and Controls (Reference Age Range)

	Age at Diagnosis or Reference Age Range
	< 30 y No. = 144		30 – 39 y No. = 391		40 – 49 y No. = 800
Characteristic	Cases No. = 76	Controls No. = 68	Cases No. = 198	Controls No. = 193	Cases No. = 407	Controls No. = 393
Women
No.	63	61	140	135	262	250
Phenotype risk score, mean	3.0	2.9	3.1	2.7b	3.1	2.8c
Blue eyes, %	46.0	41.0	42.9	33.3a	41.2	36.0
Fair or very fair skin, %	85.7	77.1	83.6	81.5	87.4	80.0
Freckles pattern (mean, score 1 – 4)	1.9	1.8	1.6	1.7	2.0	1.8a
Mole pattern (mean, score 1 – 4)	2.4	1.9d	2.3	1.8d	2.1	1.7d
Melanoma family history, %	24.6	28.8	20.1	15.4	18.5	19.6
Routine sun, median, × 100 h	11.0	11.6	15.3	14.9	20.4	21.0
Outdoor activity sun, median, × 100 h	7.7	8.2	11.3	11.1	15.1	15.4
Sunburns, median, No.	9.0	6.5	7.0	6.0	10.0	6.0d
Ever tanned indoors, %	96.8	83.6a	94.3	79.3c	78.6	62.0d
Age of initiation, median, y	16.0	16.0	16.0	17.0	24.5	25.0
Sessions, median, No.	110.0	95.0	130.0	73.0a	49.5	28.0b
Tumors located on trunk, %	33.3	NA	35.0	NA	24.4	NA
Men
No.	13	7	58	58	145	143
Phenotype risk score, mean	3.4	2.4	2.8	2.4a	2.9	2.7a
Blue eyes, %	30.8	42.9	39.7	31.0	46.9	41.3
Fair or very fair skin, %	92.3	57.2	89.7	70.7a	90.3	83.9
Freckles pattern (mean, score 1 – 4)	2.2	1.4	1.8	1.5a	1.9	1.6b
Mole pattern (mean, score 1 –4)	2.1	2.0	2.2	1.8c	2.1	1.7d
Melanoma family history, %	7.7	16.7	17.2	29.3	17.6	19.6
Routine sun, median, × 100 h	13.0	13.3	21.8	22.8	26.8	30.0
Outdoor activity sun, median, × 100 h	10.1	9.4	13.1	14.0	15.6	19.8
Sunburns, median, No.	40.0	6.0a	12.0	9.5	12.0	9.0
Ever tanned indoors, %	46.2	57.1	51.7	44.8	47.5	37.1
Age of initiation, median, y	16.5	16.0	19.5	20.5	25.0	30.0
Sessions, median, No.	7.0	70.5	22.0	12.5	20.0	24.5
Tumors located on trunk, %	46.2	NA	41.4	NA	49.0	NA

Abbreviation: NA, not applicable.

Statistical significance for difference between cases and controls:

^ap-value < 0.05;

^bp-value < 0.01;

^cp-value < 0.001;

^dp-value ≤ 0.0001.