Results of individual patient-level analysis of peritoneal dialysis use 90 days after initiation of long-term dialysis before and after fee changes*
| Model† | OR | Differences-in-differences estimator (95% CI)‡ | |
|---|---|---|---|
| Fee-for-service post–pre | Salaried post–pre | ||
| Fee change 1 (Apr. 1, 2002) | |||
| Unadjusted | 0.81 | 1.12 | 0.72 (0.35–1.48) |
| Adjusted§ | 0.83 | 0.94 | 0.89 (0.44–1.81) |
| Fee change 2 (Apr. 1, 2007) | |||
| Unadjusted | 1.10 | 0.88 | 1.24 (0.86–1.80) |
| Adjusted§ | 1.03 | 0.89 | 1.15 (0.73–1.83) |
| Fee change 3 (Apr. 1, 2009) | |||
| Unadjusted | 1.17 | 0.90 | 1.31 (0.87–1.80) |
| Adjusted§ | 1.31 | 0.87 | 1.52 (0.96–2.40) |
Note: CI = confidence interval, OR = odds ratio.
↵* The same subset of data served for the periods after fee change 2 and before fee change 3.
↵† Fee change 1: weekly fee-for-service remuneration for peritoneal dialysis introduced at $32.16; fee change 2: weekly fee-for-service remuneration for peritoneal dialysis increased from $49.15 to $70.94; fee change 3: weekly fee-for-service remuneration for all patients receiving dialysis $135.
↵‡ The differences-in-differences estimator is the odds ratio for peritoneal dialysis use in the fee-for-service group after versus before a fee change, divided by the odds ratio for peritoneal dialysis use in the salaried group after versus before a fee change.
↵§ Adjusted model controlled for patient-level covariates shown in Tables 1 and 2.