Table 1 Characteristics of cases and controls by XPD Asp312Asn and Lys751Gln polymorphisms

	XPD 312						XPD 751
	Case			Control			Case			Control
	Asp/Asp (G/G)	Asp/Asn (G/A)	Asn/Asn (A/A)	Asp/Asp (G/G)	Asp/Asn (G/A)	Asn/Asn (A/A)	Lys/Lys (A/A)	Lys/Gln (A/C)	Gln/Gln (C/C)	Lys/Lys (A/A)	Lys/Gln (A/C)	Gln/Gln (C/C)
	n=52	n=94	n=18	n=59	n=89	n=24	n=58	n=94	n=24	n=59	n=85	n=33
Age (years)
17–49	31	43	6	28	58	16	34	42	9	30	54	21
50–77	21	51	12	31	31	8	24	52	15	29	31	12
Gender
Male	28	41	9	30	43	12	34	37	13	33	40	16
Female	24	53	9	29	46	12	24	57	11	26	45	17
Eye colour ^a
Dark	13	27	2	19	38	11	19	22	4	20	36	17
Medium	24	54	12	33	42	10	27	55	16	32	40	13
Light	15	13	4	7	8	3	12	17	4	7	8	3
Skin colour
Dark/medium	22	43	6	37	62	16	26	41	9	41	56	23
Light	29	51	12	22	27	8	31	53	15	18	29	10
Tanning ability to prolonged sun exposure
High/medium	36	57	10	51	71	21	41	54	16	47	70	29
Low	15	33	8	8	15	2	16	37	7	11	11	4
Dysplastic naevi ^b
No	12	32	8	29	60	14	9	34	12	33	52	20
Yes	23	27	5	11	11	6	26	29	4	10	14	5

^aDark – black or dark brown. Medium – light brown, brown-green, green or blue-green. Light – light blue, dark blue or grey.
^bSubjects older than 60 years of age were considered as with uncertain dysplastic naevus status. The total number of subjects may vary across variables due to missing values.

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