Table II.

Cox proportional hazards models for the treatment with ultraviolet B (UVB) phototherapy on study outcomes

	Skin cancer			Non-melanoma skin cancer			Cutaneous melanoma
	HR	95% CI	p-value	HR	95% CI	p-value	HR	95% CI	p-value
Model 1a
Treatment with UVB phototherapy	1.236	0.713–2.141	0.45	1.260	0.713–2.225	0.43	0.956	0.112–8.199	0.97
Model 2b
Treatment with UVB phototherapy	1.255	0.724–2.176	0.42	1.279	0.724–2.261	0.40	0.969	0.113–8.337	0.98
Age, years	1.048	1.028–1.069	< 0.001	1.046	1.026–1.067	< 0.001	1.072	0.995–1.154	0.07
Male sex	1.679	1.057–2.666	0.03	1.574	0.977–2.535	0.06	4.398	0.511–37.869	0.18
Model 3c
Treatment with UVB phototherapy	1.066	0.584–1.944	0.84	1.067	0.571–1.996	0.84	1.009	0.115–8.879	0.99
Age, years	1.065	1.041–1.089	< 0.001	1.061	1.037–1.086	< 0.001	1.117	1.018–1.224	0.02
Male sex	1.738	1.076–2.808	0.02	1.627	0.992–2.669	0.05	4.208	0.482–36.717	0.19
Outdoor occupation	2.104	1.293–3.423	0.003	1.974	1.186–3.285	0.01	4.451	0.846–23.417	0.08
High UV indexd	1.110	0.695–1.773	0.66	1.257	0.772–2.048	0.36	0.208	0.023–1.846	0.16
Organ transplantation	5.911	3.178–10.995	< 0.001	5.389	2.815–10.314	< 0.001	17.769	2.021–156.189	0.01
Hydrochlorothiazide	1.368	0.861–2.175	0.19	1.324	0.816–2.150	0.26	2.006	0.396–10.160	0.40

^aModel 1: Univariate Cox proportional hazards model adjusted for treatment with UVB phototherapy.

^bModel 2: Multivariate Cox for the variable in model 1 and for age and sex.

^cModel 3: Multivariate Cox proportional hazards model adjusted for all variables in index, organ transplantation, and the prescription of hydrochlorothiazide.

^dMean UV index >6 at location of residence.

CI: confidence interval; HR: hazard ratio.