Table 4.

Model‐Estimated Parameter Estimates, Standard Errors, and Log Ratios from the Correlated Conditional Two‐Part REMa

Coefficient	Estimate of Effect on $\text{Pr}({\text{Cost}}_{\mathit{ij}}>0|{\mathbf{b}}_i)$ (SE)	Estimate of Effect on $E[ln({\text{Cost}}_{\mathit{ij}}|{\text{Cost}}_{\mathit{ij}}>0)]$ (SE)	Year	Log Ratio of Expected Specialty Expenditures for Those Required to Pay Copayments vs. Those Not Required (95% CI)
Intercept	2.01 (0.10)	6.04 (0.04)	2000	−0.30 (−0.41,−0.18)
Year2001	0.29 (0.11)	0.07 (0.04)	2001	−0.05 (−0.18,0.08)
Year2002	0.64 (0.11)	0.13 (0.04)	2002	−0.26 (−0.40,−0.13)
Year2003	0.33 (0.11)	0.23 (0.04)	2003	−0.35 (−0.50,−0.22)
MUSTPAY	−1.03 (0.13)	−0.17 (0.06)
MUSTPAY*Year2001	−0.06 (0.14)	−0.04 (0.06)
MUSTPAY*Year2002	−0.23 (0.14)	−0.23 (0.06)
MUSTPAY*Year2003	−0.21 (0.14)	−0.31 (0.06)

^aFit via ML on log expenditures with random intercept in binary part and random intercept and slope in conditionally positive continuous part.