Table 3.

GM UFRBW (mL/hr-kg) from NHANES 2009–2012 by age group, sex, race/ethnic group, and BMI categories.

Mean	6–11 years		12–19 years		20–39 years		40–59 years		≥ 60 years
	GM (95% CI)	p-Valuea	GM (95% CI)	p-Valuea	GM (95% CI)	p-Valuea	GM (95% CI)	p-Valuea	GM (95% CI)	p-Valuea
All	1.01 (0.95, 1.07)	< 0.001b	0.67 (0.63, 0.70)	0.5b	0.65 (0.62, 0.69)	Reference	0.64 (0.62, 0.66)	0.4b	0.56 (0.53, 0.58)	< 0.001b
Sex
Male (reference)	1.04 (0.97, 1.11)	Reference	0.66 (0.61, 0.71)	Reference	0.64 (0.61, 0.67)	Reference	0.62 (0.59, 0.65)	Reference	0.56 (0.53, 0.59)	Reference
Female	0.98 (0.89, 1.07)	0.3	0.67 (0.63, 0.72)	0.7	0.66 (0.61, 0.72)	0.3	0.66 (0.63, 0.68)	0.04	0.55 (0.52, 0.59)	0.7
Race/ethnic group
Mexican American	0.94 (0.85, 1.03)	0.02	0.67 (0.62, 0.72)	0.5	0.57 (0.53, 0.62)	< 0.001	0.55 (0.51, 0.60)	< 0.001	0.49 (0.43, 0.56)	0.05
Non-Hispanic White	1.08 (0.98, 1.19)	Reference	0.70 (0.64, 0.75)	Reference	0.71 (0.66, 0.75)	Reference	0.67 (0.64, 0.70)	Reference	0.57 (0.54, 0.60)	Reference
Non-Hispanic Black	0.87 (0.78, 0.97)	0.005	0.55 (0.51, 0.59)	< 0.001	0.46 (0.43, 0.49)	< 0.001	0.49 (0.46, 0.51)	< 0.001	0.47 (0.44, 0.49)	< 0.001
Other	1.09 (0.95, 1.25)	0.9	0.72 (0.64, 0.82)	0.6	0.75 (0.69, 0.83)	0.1	0.75 (0.65, 0.87)	0.1	0.61 (0.52, 0.71)	0.3
BMI
< 20 (reference)	1.12 (1.05, 1.21)	Reference	0.84 (0.77, 0.91)	Reference	0.87 (0.75, 1.00)	Reference	1.06 (0.86, 1.31)	Reference	0.80 (0.68, 0.95)	Reference
20 to < 25	0.85 (0.75, 0.96)	< 0.001	0.69 (0.64, 0.74)	< 0.001	0.81 (0.75, 0.87)	0.4	0.87 (0.80, 0.95)	0.06	0.66 (0.60, 0.73)	0.04
25 to < 30	0.65 (0.57, 0.75)	< 0.001	0.57 (0.52, 0.63)	< 0.001	0.66 (0.61, 0.72)	0.004	0.66 (0.62, 0.70)	< 0.001	0.59 (0.55, 0.64)	0.004
≥ 30	0.43 (0.35, 0.52)	< 0.001	0.46 (0.41, 0.51)	< 0.001	0.49 (0.46, 0.52)	< 0.001	0.48 (0.46, 0.50)	< 0.001	0.45 (0.43, 0.48)	< 0.001
ap-Values present comparison with reference group within each age stratum for each categorization (sex, race/ethnic group, or BMI category), except as otherwise indicated. bCompared with ages 20–39 years.