Table 5.

Budget impact model results (base case and sensitivity analyses) (Can$)

Base case	Baseline	Year 1	Year 2	Year 3	Total 3 years
% Switching (IVIG to SCIG)	—	50	50	50	—
Number of patients IVIG	456	228	228	228	—
Number of patients SCIG	0	228	228	228	—
Total cost IVIG ($)	1 172 525	586 262	586 262	586 262	1 758 787
Total cost SCIG ($)	0	198 178	126 358	126 358	450 893
Incremental cost ($)	—	−388 085	−459 905	−459 905	−1 307 894
% Increment	—	−33	−39	−39	−37
Sensitivity analysis A (IVIG 13 visits—4 h)
Total cost IVIG ($)	1 065 931	532 966	532 966	532 966	1 598 897
Total cost SCIG ($)	0	198 178	126 358	126 358	450 893
Incremental cost ($)	—	−334 788	−406 608	−406 608	−1 148 004
% Increment	—	−31	−38	−38	−36
Sensitivity analysis B (IVIG 17 visits—6 h)
Total cost IVIG ($)	1 936 550	968 275	968 275	968 275	2 904 826
Total cost SCIG ($)	0	198 178	126 358	126 358	450 893
Incremental cost ($)	—	−770 098	−841 918	−841 918	−2 453 933
% Increment	—	−40	−43	−43	−42
Sensitivity analysis C (switching 75%)
Number of patients IVIG	456	114	114	114	—
Number of patients SCIG	0	342	342	342	—
Total cost IVIG ($)	1 172 525	293 131	293 131	293 131	879 393
Total cost SCIG ($)	0	297 266	189 536	189 536	676 339
Incremental cost (4)	—	−582 127	−689 857	−689 857	−1 961 841
% Increment	—	−50	−59	−59	−56

IVIG, intravenous immunoglobulin; SCIG, subcutaneous immunoglobulin.