Dickerson et al. BMC Public Health 2011, 11:926 http://www.biomedcentral.com/1471-2458/11/926 Page 7 of 10 Table 2 Simultaneous Quantile Regression Results–by Body Mass Index Classification Dependent Variable: Body Mass Index Model Parameters Observations = 1,770 Iterations = 100 Categories = 5 Independent Variables Coefficient Bootstrap Standard Error t Normal Weight (n = 477) Age -0.04 Sex (1 = Male, 2 = Female) -1.75 Non-Hispanic White 0.29 African-American 0.10 Hispanic 1.51 Rurality (0 = Urban, 1 = Rural) 0.53 Educational Attainment (1 = First Grade, 17 = Graduate School) -0.04 Minutes per week of moderate physical activity -0.0004 Hours per day spent watching television 0.35 Constant 26.28 Overweight (n = 664) Age -0.07 Sex (1 = Male, 2 = Female) -1.32 Non-Hispanic White 1.48 African-American 3.8 Hispanic 2.15 Rurality (0 = Urban, 1 = Rural) 0.82 Educational Attainment (1 = First Grade, 17 = Graduate School) -0.13 Minutes per week of moderate physical activity -0.0006 Hours per day spent watching television 0.87 Constant 31.45 Obese Class I (n = 427) Age -0.15 Sex (1 = Male, 2 = Female) -0.63 Non-Hispanic White 2.14 African-American 5.61 Hispanic 3.11 Rurality (0 = Urban, 1 = Rural) 0.49 Educational Attainment (1 = First Grade, 17 = Graduate School) -0.36 Minutes per week of moderate physical activity -0.0010 Hours per day spent watching television 1.02 Constant 42.15 Obese Class II (n = 177) Age -0.19 Sex (1 = Male, 2 = Female) 0.44 Non-Hispanic White 2.63 African-American 8.25 Hispanic 2.50 Rurality (0 = Urban, 1 = Rural) -0.07 Educational Attainment (1 = First Grade, 17 = Graduate School) -0.53 Minutes per week of moderate physical activity -0.0020 Hours per day spent watching television 0.91 Constant 49.62 0.01 0.45 0.58 1.07 0.74 0.45 0.08 0.0004 0.19 2.06 0.01 0.30 0.62 1.12 0.75 0.34 0.07 0.0005 0.15 1.66 0.01 0.39 0.94 1.48 1.33 0.38 0.10 0.0004 0.19 2.15 0.03 0.59 1.58 2.21 1.32 0.67 0.13 0.0006 0.24 3.77 p 95% Confidence Interval Lower Upper -3.27 -3.92 0.50 0.09 2.05 1.18 -0.56 -0.83 1.84 12.75 -4.91 -4.37 2.39 3.38 2.88 2.41 -1.72 -1.29 5.78 18.96 0.001 -0.07 <0.001 -2.63 0.614 -0.85 0.925 -2.00 0.041 0.06 0.238 -0.35 0.574 -0.19 0.407 -0.0010 0.066 -0.02 <0.001 22.24 <0.001 -0.09 <0.001 -1.91 0.017 0.27 0.001 1.59 0.004 0.68 0.016 0.15 0.086 -0.27 0.197 -0.0020 <0.001 0.57 <0.001 28.20 -10.33 <0.001 -0.18 -1.61 0.107 -1.39 2.27 0.023 0.29 3.80 <0.001 2.71 2.34 0.020 0.50 1.29 0.197 -0.26 -3.68 <0.001 -0.56 -2.77 0.006 -0.0020 5.36 <0.001 0.65 19.62 <0.001 37.93 -6.46 0.74 1.67 3.74 1.90 -0.11 -3.96 -3.12 3.81 13.16 <0.001 -0.25 0.462 -0.73 0.095 -0.46 <0.001 3.92 0.058 -0.08 0.915 -1.39 <0.001 -0.80 0.002 -0.0030 <0.001 0.44 <0.001 42.22 -0.02 -0.88 1.43 2.20 2.96 1.42 0.11 0.0005 0.71 30.33 -0.04 -0.72 2.69 6.00 3.62 1.48 0.02 0.0003 1.16 34.7 -0.12 0.14 3.98 8.51 5.72 1.24 -0.17 -0.0003 1.40 46.36 -0.13 1.60 5.72 12.58 5.08 1.25 -0.27 -0.0007 1.37 57.01