Table 2.

Mixed Model Result: Outcome: 25(OH)D

	Unadjusted Model	Adjusted Model
Predictor	Coefficient (95% CI)	Full Model	Reduced Model
Age
≤ 9 yrs old	(Reference)	(Reference)
> 9 yrs old	1.14(−2.04,4.32)	0.32(−3.08,3.72)
Sex
Male	(Reference)	(Reference)	(Reference)
Female	−2.10(−5.30,1.10)	−2.01(−5.34,1.31)	−2.05(−5.21,1.11)
Race and Season
Caucasian/Summer	(Reference)	(Reference)	(Reference)
Caucasian /Winter	−9.61(−14.45,−4.77) ***	−9.29(−14.31,−4.26) ***	−9.20(−13.97,−4.42) ***
AA/Summer	−6.22(−10.60,−1.84) **	−4.19(−10.17,1.78)	−6.08(−10.47,−1.69) **
AA/Winter	−11.44(−15.82,−7.07) ***	−9.61(−15.67,−3.54) **	−11.20(−15.60,−6.80) ***
Skin Type
Easily burn(I,II,III)	(Reference)	(Reference)
Not easily burn(IV,V)	−4.71(−8.06,−1.36) **	−2.38(−7.48,2.72)
BMI (continuous)	−0.07(−0.48,0.34)	0.03(−0.41,0.48)
Diet Vitamin D
Caucasian/Summer	−0.01(−0.02,0.01)	−0.01(−0.02,0.01)	−0.01(−0.02,0.01)
Caucasian /Winter	0.02(0.01,0.04) **	0.02(0.00,0.04) **	0.02(0.01,0.04) **
AA/Summer	−0.00(−0.01,0.01)	0.00(−0.01,0.01)	0.00(−0.01,0.01)
AA/Winter	−0.00(−0.01,0.00)	−0.00(−0.01,0.01)	−0.00(−0.01,0.00)
Sun Exposure
2 hrs or less	(Reference)	(Reference)
More than 2 hrs	−2.86(−7.90,2.18)	−1.46(−6.38,3.47)
Sunscreen
No	(Reference)	(Reference)
Yes	3.23(0.08,6.38) *	0.65(−3.21,4.50)

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