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Table 3 Mean parameter estimates (β) with corresponding 2.5% and 97.5% quantiles from a bootstrap study of 10,000 replications with sample size n = 5000

From: Using quantile regression to investigate racial disparities in medication non-adherence

  QReg   
  Quantile1 Quantile2 Quantile3 Quantile4 OLS GLMM
Parameter β (95%CI) β (95%CI) β (95%CI) β (95%CI) β (95%CI) β (95%CI)
Intercept 39.83 (14.7,61.3) 48.8(28.4,69.2) 71.5(60.5,81.5) 82.5(76.4,88.8) 88.23(84.4,91.9) 92.21(88.7,95.2)
NHB -3.54(-11.2,3.43) -4.55(-10.9,1.7) -2.91(-5.6,-0.19) -1.87(-3.3,-0.54) -1.38(-2.31,-0.46) -1.42(-2.10,-0.77)
Other -5.94(-14.4,2.2) -4.38(-13.2,3.1) -1.05(-3.8,1.60) 0.44(-1.2,2.1) -0.12(-1.10,0.85) -0.65(-1.49,0.11)
NHW (REF)       
Male -11.8(-22.8,0.39) -6.78(-16.6,3.6) 0.61(-4.9,7.8) 1.13(-3.2,5.5) -0.51(-2.88,2.01) -0.55(-2.50,1.50)
Age 0.24(-0.01,0.55) 0.27(0.01,0.52) 0.17(0.05,0.29) 0.13(0.06,0.19) 0.08(0.03,0.12) 0.04(0.01,0.08)
Age2 -0.01(-0.02,0.01) -0.01(-0.02,0.01) -0.01(-0.02,0.002) -0.01(-0.01,-0.001) -0.01(-0.01,0.00) -0.01(-0.01,-0.001)
Never Married -3.51(-12.9,6.9) -5.69(-15.9,6.6) -0.76(-5.3,2.9) -2.09(-5.1,0.91) -0.88(-2.71,0.88) -0.83(-0.41,2.12)
Divorced -3.45(-9.7,2.2) -4.67(-10.9,1.2) -3.13(-5.9,-0.57) -2.57(-4.0,-1.1) -1.44(-2.36,-0.56) -0.91(-0.24,1.59)
Married (REF)       
Employed 5.10(-1,8,13.1) 4.58(-2.8,11.4) 2.60(-0.17,5.42) 1.16(-4.57,2.9) 1.27(0.20,2.33) 0.08(-0.85,0.97)
Retired -0.06(-6.9,7.8) 1.42(-5.2,7.5) 1.68(-0.91,4.36) 1.22(-0.15,2.6) 0.63(-0.27,1.53) -0.65(-1.35,0.00)
Unemployed (REF)       
Cancer -8.20(-19.2,2.7) -11.4(-23.5,1.7) -3.14(-9.9,2.99) -0.45(-3.6,2.2) -1.37(-3.45,0.57) -0.45(-1.89,0.81)
CHD 11.8(0.82,21.2) 8.27(0.94,15.6) 0.65(-2.6,4.32) 0.20(-1.9,2.2) 0.70(-0.64,2.04) -0.14(-1.04,0.79)
CHF 0.68(-10.4,11.2) -0.29(-7.8,7.4) -1.05(-4.7,2.46) -2.05(-4.7,0.28) -0.87(-2.45,0.66) -0.79(-1.93,0.27)
Hypertension (ICD) 1.36(-6.7,11.2) -0.89(-8.6,6.8) -1.30(-4.7,1.54) -1.69(-3.5,0.05) -1.13(-2.33,0.05) -0.09(-0.88,0.67)
Poor HbA1c 10.2(0.5,18.2) 6.45(0.34,12.0) -0.84(-3.6,1.72) -2.59(-4.3,-0.99) -1.00(-2.03,0.02) -4.13(-4.89,-3.34)
Stroke -0.76(-12.3,10.9) -4.04(-13.3,5.9) -1.18(-10.3,4.29) -0.48(-4.2,2.6) -0.60(-2.87,1.55) -0.05(-1.47,1.27)
Bipolar Disorder -3.68(-24.3,19.9) -1.57(-22.7,18.3) 1.49(-4.5,7.1) -0.35(-4.9,3.9) -0.24(-3.35,2.50) -0.31(-1.71,2.06)
GAD 3.89 (-9.5,18.9) 0.50(-14.7,13.2) 2.36(-5.9,7.9) 1.57(-1.5,3.9) 0.88(-1.58,3.12) 0.74(-0.86,2.36)
Psychoses 5.90(-12.0,22.4) 4.72(-12.7, 17.1) -2.38(-8.9,4.6) -0.07(-6.1,3.7) 0.001(-2.7,2.6) -0.65(-2.78,1.23)
PTSD 0.13(-11.7,12.5) -0.75(-13.2, 9.5) 2.30(-3.1,6.5) 1.50(-0.72,3.5) 0.68(-1.01,2.20) 0.58(-0.66,1.86)
Substance Use 5.65(-3.1,15.2) 5.53(-2.5,12.7) 2.90(-0.001,5.7) 1.41(-0.06,2.8) 1.00(-0.01,2.00) 0.26(-0.48,0.99)
  1. NHB = Non-Hispanic Black (Reference = Non-Hispanic White, NHW)
  2. Other = Other race groups
  3. β = Mean bootstrapped Parameter Estimate
  4. Quantile 1 = 0.02 corresponding to a medication possession ratio (MPR) of 40%
  5. Quantile 2 = 0.04 corresponding to a medication possession ratio (MPR) of 60.%
  6. Quantile 3 = 0.15 corresponding to a medication possession ratio (MPR) of 80.%
  7. Quantile 4 = 0.27 corresponding to a medication possession ratio (MPR) of 90%
  8. 95% CI = 95% confidence interval based on 2.5% and 97.5% quantiles from a bootstrap study