Random-Effect Variance Parameter Estimates | ||||||
Estimate | Standard Error | |||||
Intercept | 0.52 | 0.01 | ||||
Linear trend | 0.15 | 0.01 | ||||
Quadratic trend | 0.09 | 0.01 | ||||
Scale | 0.08 | 0.005 | ||||
Fixed Effects b | ||||||
Label | RR (95% CI) c | DF | t | P value | ||
Intercept | 1.16 (1.02–1.32) | 16,650 | 2.28 | 0.0224 | ||
Sex: male vs. female | 0.9 (0.87–0.93) | 16,650 | −6.62 | <0.0001 | ||
Education: college graduate vs. non–college graduate | 0.96 (0.93–0.99) | 16,650 | −2.92 | 0.0035 | ||
Race: Caucasian vs. nonwhite | 1.19 (1.14–1.23) | 16,650 | 8.78 | <0.0001 | ||
Household income: at or above national median vs. those below | 0.96 (0.94–0.99) | 16,650 | −2.42 | 0.0155 | ||
Comorbid count | 1.07 (1.05–1.09) | 16,650 | 8.06 | <0.0001 | ||
Disability: MIDAS category TIC | 1.47 (1.46–1.49) | 16,650 | 73.56 | <0.0001 | ||
Age at onset, y | 0.998 (0.997–0.999) | 16,650 | −3.20 | 0.0014 | ||
Duration of illness | 1.00 (1.00–1.00) | 16,650 | 0.83 | 0.4090 | ||
Linear trend | 0.74 (0.73–0.76) | 29,304 | −28.63 | <0.0001 | ||
Quadratic trend | 1.09 (1.07–1.11) | 29,304 | 8.35 | <0.0001 | ||
Cubic trend | 0.99 (0.97–1.01) | 29,304 | −1.34 | 0.1797 | ||
Headache status: CM vs. EM | 3.95 (3.84–4.07) | 29,304 | 90.71 | <0.0001 | ||
Headache status by linear trend interaction | 1.26 (1.2–1.33) | 29,304 | 9.34 | <0.0001 | ||
Headache status by quadratic trend interaction | 0.99 (0.94–1.03) | 29,304 | −0.51 | 0.6434 | ||
Headache status by cubic trend interaction | 1.00 (0.96–1.04) | 29,304 | −0.17 | 0.8627 |