Table 2.
Adjusted parameter estimates (β) and p-values for quantile regression, ordinary least-squares regression, and the generalized linear mixed model
| QReg | OLS | GLMM | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Quantile 1 | Quantile 2 | Quantile 3 | Quantile 4 | |||||||||
| Parameter | β | P | β | P | β | P | β | P | β | P | β | P |
| Intercept | 38.2 | 0.00 | 49.2 | 0.00 | 72.1 | 0.00 | 82.6 | 0.00 | 88.2 | 0.00 | 89.5 | 0.00 |
| NHB | -3.42 | 0.11 | -5.42 | 0.01 | -3.1 | 0.00 | -2.0 | 0.00 | -1.4 | 0.00 | -1.3 | 0.00 |
| Other | -6.33 | 0.00 | -3.75 | 0.09 | -0.9 | 0.34 | 0.5 | 0.36 | -0.1 | 0.74 | -0.1 | 0.70 |
| NHW (REF) | ||||||||||||
| Male | -11.4 | 0.04 | -7.00 | 0.22 | 0.4 | 0.86 | 1.1 | 0.42 | -0.5 | 0.58 | -0.4 | 0.62 |
| Age | 0.24 | 0.01 | 0.27 | 0.00 | 0.2 | 0.00 | 0.1 | 0.00 | 0.1 | 0.00 | 0.1 | 0.00 |
| Age-squared | -0.01 | 0.14 | -0.01 | 0.04 | 0.0 | 0.11 | 0.0 | 0.00 | 0.0 | 0.00 | 0.0 | 0.00 |
| Never Married | -2.84 | 0.45 | -7.62 | 0.05 | -0.5 | 0.79 | -1.8 | 0.06 | -0.9 | 0.16 | 0.9 | 0.13 |
| Divorced | -3.37 | 0.09 | -5.35 | 0.01 | -2.9 | 0.00 | -2.6 | 0.00 | -1.4 | 0.00 | 1.2 | 0.00 |
| Married (REF) | ||||||||||||
| Employed | 5.49 | 0.02 | 4.52 | 0.07 | 2.8 | 0.01 | 1.1 | 0.06 | 1.3 | 0.00 | 0.6 | 0.15 |
| Retired | -1.03 | 0.61 | 2.04 | 0.34 | 1.9 | 0.04 | 1.3 | 0.01 | 0.6 | 0.06 | -0.6 | 0.04 |
| Unemployed (REF) | ||||||||||||
| Cancer | -8.24 | 0.05 | -13.0 | 0.00 | -3.1 | 0.10 | -0.4 | 0.70 | -1.4 | 0.05 | -1.0 | 0.11 |
| CHD | 14.8 | 0.00 | 8.2 | 0.01 | 0.0 | 1.00 | 0.4 | 0.65 | 0.7 | 0.19 | 0.5 | 0.31 |
| CHF | 1.37 | 0.71 | 0.3 | 0.93 | -1.0 | 0.54 | -2.0 | 0.04 | -0.9 | 0.16 | -0.9 | 0.08 |
| Hypertension | 0.46 | 0.86 | -0.5 | 0.85 | -0.8 | 0.51 | -1.6 | 0.02 | -1.1 | 0.01 | -0.9 | 0.02 |
| Poor HbA1c | 12.2 | 0.00 | 7.1 | 0.01 | -0.6 | 0.58 | -2.7 | 0.00 | -1.0 | 0.02 | -5.0 | 0.00 |
| Stroke | -1.60 | 0.75 | -4.7 | 0.37 | -0.5 | 0.81 | -0.7 | 0.58 | -0.6 | 0.47 | -0.5 | 0.47 |
| Bipolar | -4.16 | 0.54 | -5.1 | 0.47 | 2.3 | 0.45 | -0.6 | 0.72 | -0.2 | 0.84 | 0.1 | 0.93 |
| GAD | 1.53 | 0.79 | -1.1 | 0.86 | 3.7 | 0.16 | 1.6 | 0.28 | 0.9 | 0.36 | 0.6 | 0.45 |
| Psychoses | 7.28 | 0.23 | 6.8 | 0.28 | -3.4 | 0.21 | 0.9 | 0.57 | 0.0 | 1.00 | -0.5 | 0.53 |
| PTSD | -3.30 | 0.40 | -1.6 | 0.70 | 2.6 | 0.14 | 1.4 | 0.18 | 0.7 | 0.30 | 0.9 | 0.12 |
| Substance Use | 7.00 | 0.01 | 5.78 | 0.03 | 2.6 | 0.02 | 1.5 | 0.02 | 1.0 | 0.02 | 0.8 | 0.03 |
NHB = Non-Hispanic Black
NHW = Non-Hispanic White (Reference)
Other = Other race groups
β = Parameter Estimate
P = p-value
OLS = Ordinary Least Squares
GLMM = Generalized Linear Mixed Model
QReg = Quantile Regression
Quantile 1 = 0.02 corresponding to a medication possession ratio (MPR) of 40%
Quantile 2 = 0.04 corresponding to a medication possession ratio (MPR) of 60%
Quantile 3 = 0.15 corresponding to a medication possession ratio (MPR) of 80%
Quantile 4 = 0.27 corresponding to a medication possession ratio (MPR) of 90%