The measure of output selected as the dependent variable in the multivariate analysis of production was total dialysis treatments per month, weighted by modality-specific cost (Feldstein 1968) to adjust for the fact that each treatment modality (outpatient maintenance hemodialysis, outpatient maintenance intermittent peritoneal dialysis
, home maintenance hemodialysis, home maintenance intermittent peritoneal dialysis
, home maintenance continuous ambulatory/continuous cycling peritoneal dialysis, hemodialysis training, intermittent peritoneal dialysis
training, continuous ambulatory/continuous cycling peritoneal dialysis training) involves unique and distinguishable resource inputs (Dor, Held, and Pauly 1992).
Intraperitoneal dialysis transfers were usually from CAPD to the various offshoots of PD, such as daytime ambulatory peritoneal dialysis (DAPD), nighty intermittent peritoneal dialysis
(NIPD), tidal peritoneal dialysis (TPD), and continuous cyclic peritoneal dialysis (CCPD) (Twardowski, Moore, Prowant, & Satalowich, 1990).