Table 3.

Correlates of ever indoor tanning among females (n = 281)

		% Ever
		Tanned	Univariate	P valuea		Multivariate	P valueb
Characteristic	N	Indoors	OR (95% CI)		N	OR (95% CI)
Eye color
Brown	114	79	1.00		101	1.00
Hazel	55	75	0.78 (0.37 - 1.66)		51	0.76 (0.31 - 1.83)
Green	32	53	0.30 (0.13 - 0.69)		30	0.18 (0.07 - 0.50)
Blue/grey	80	72	0.70 (0.36 - 1.37)	0.047	74	0.72 (0.33 - 1.57)	0.008
Skin Color
Olive	57	75	1.00
Fair	166	77	1.10 (0.54 - 2.22)
Very fair	58	60	0.50 (0.22 - 1.10)	0.05
Skin reaction with first summer sun exposure
Sunburn	126	67	1.00
Tan	155	78	1.72 (1.01 - 2.92)	0.046
Skin reaction with prolonged sun exposure
Deep tan	48	88	1.00		42	1.00
No/Mild/Moderate Tan	233	70	0.34 (0.14 - 0.84)	0.009	214	0.37 (0.12 - 1.18)	0.07
BMI (kg/m2)	280	-	0.97 (0.92 - 1.01)	0.117
Pounds Gained since age 18 (per 10 lbs)	278	-	0.81 (0.66 - 0.99)	0.037	256	0.80 (0.63 -1.02)	0.063
Alcoholic drinks under age 25 (per 300 drinks)	275	-	1.01 (0.98 - 1.05)	0.454
Alcoholic drinks/year over age 25 (per 100 drinks)	262	-	1.00 (0.90 - 1.11)	0.988
Smoking Status
Not Current Smoker	238	72	1.00
Current Smoker	41	83	1.86 (0.79 - 4.41)	0.136
Education
Less than Bachelor's Degree	94	78	1.00
Bachelor's Degree or more	185	72	0.74 (0.41 - 1.32)	0.296
Sunbathing session ages 8-15 (per 50 sessions)	279	-	1.25 (1.13 - 1.39)	< 0.001	256	1.26 (1.11 - 1.42)	< 0.001
Sunbathing session ages 16-25 (per 50 sessions)	279	-	1.18 (1.09 - 1.29)	< 0.001
Sunbathing session ages 26+ (per 50 sessions)	257	-	1.29 (1.12 - 1.49)	< 0.001	256	1.23 (1.05 - 1.44)	0.003
Age at skin biopsy	281	-	0.98 (0.93 - 1.04)	0.549	256	0.90 (0.81 - 0.99)	0.037

^aP values are from likelihood ratio tests comparing a model with the variable of interest to the null model.

^bP values are from likelihood ratio tests comparing the full model to the full model minus the variable of interest.

BMI body mass index; CI confidence interval; OR odds ratio