Table 2: Unadjusted geometric means with 95% confidence interval in ng/dL by blood draw session for males by age and race/ethnicity.

Data from National Health and Nutrition Examination Survey 2011-2012.

	Blood Draw Session			Statistically Significant Differences
	Morning (M)	Afternoon (A)	Evening (E)
Age: 6-11 Years old
Total	4.5 (3.4-5.9)	3.9 (3.2-4.8)	2.5 (1.9-3.2)	M > E (p < = 0.01), A > E (p = 0.01)
Non-Hispanic White	4.4 (3-6.6)	4.2 (2.8-6.3)	2.6 (1.8-3.7)	M > E (p = 0.046), A > E (p = 0.034)
Non-Hispanic Black	4.5 (2.7-7.4)	3.3 (2-5.4)	2.1 (1.4-3.3)	M > E (p = 0.026)
Hispanic	4.5 (2.7-7.3)	3.5 (2.7-4.6)	2.6 (1.8-3.8)
Non-Hispanic Asian	4.8 (2.3-10.4)	4.4 (2.3-8.3)	8.4 (3.5-19.8)
Other Race/Ethnicities	4 (2.3-6.9)	6.9 (2-23.4)	1.1 (0.6-1.8)	M > E (p < 0.01), A > E (p = 0.01)
Age: 12-19 Years old
Total	336.7 (292.4-387.7)	214 (161.5-283.6)	180.3 (118-275.4)	M > A (p < 0.01), M > E (p < 0.01)
Non-Hispanic White	335.8 (261.1-431.9)	179.6 (99.2-325)	154.8 (77.4-309.3)	M > A (p = 0.03)
Non-Hispanic Black	363.7 (316.9-417.4)	277.5 (184.7-416.9)	265.1 (194.8-360.6)
Hispanic	326.4 (249-427.9)	241.3 (200.9-289.8)	228.7 (166.5-314.1)
Non-Hispanic Asian	379.1 (287.4-500.1)	247.1 (168.5-362.4)	260.2 (155.1-436.6)
Other Race/Ethnicities	231.1 (165.1-323.6)	294.1 (210.3-411.4)	150.2 (92.7-243.4)	A < E (p = 0.049)
Age: ≥ 20 Years old
Total	391.3 (373.7-409.6)	347.5 (327.1-369.1)	323.5 (297-352.5)	M > A (p < 0.01), M > E (p < 0.01)
Non-Hispanic White	387.7 (366.6-410)	346 (320.9-373)	315.6 (285.9-348.3)	M > A (p = 0.01), M > E (p < 0.01)
Non-Hispanic Black	374.1 (339.2-412.6)	364.7 (348.9-381.3)	370 (313.8-436.2)
Hispanic	406.4 (372.7-443.2)	337.3 (317.6-358.1)	336.1 (299.8-376.9)	M > A (p < 0.01), M > E (p = 0.01)
Non-Hispanic Asian	415.5 (388.5-444.4)	343.2 (319.9-368.2)	352 (314.5-393.9)	M > A (p < 0.01), M > E (p < 0.01)
Other Race/Ethnicities	411.2 (358.4-471.9)	359.4 (260.5-496)	288.7 (209.8-397.4)	M > E (p = 0.046)