Table 4. Relationship of 25-hydroxyvitamin D concentration (per 10 nmol/L) to the histopathological indicators of melanoma prognosis with adjustment for confounding factors.

Model	Crude OR	95% CI	P-value	Adjusted OR	95% CI	P-value
Breslow thickness(≥0.75 mm)	0.75	0.54, 1.02	0.07	0.78 a	0.55, 1.11	0.17
Clark level(Levels 2–5)	0.88	0.72, 1.09	0.26	0.93 b	0.71, 1.22	0.60
Mitotic activity(present)	0.91	0.71, 1,17	0.47	0.96 c	0.70, 1.33	0.82

OR: odds ratio; CI: confidence interval.

^a Adjusted for age, sex, ITA value, BMI, season at diagnosis

^b Adjusted for age, sex, ITA value, BMI, season at diagnosis, naevi burden at diagnosis, number of primary school sunburns

^c Adjusted for age, sex, ITA value, BMI, season at diagnosis, naevi burden at diagnosis, number of primary school sunburns