Table 7.
Basis functions (BFs) for the MARS model.
| Bm | Definition | am | Clinical and proteomics variable descriptor |
|---|---|---|---|
| BF2 | (75 – TBSA)+ | −0.00 | % TBSA |
| BF3 | (INJ – 3.35E‐009)+*(TBSA – 75)+ | −0.05 | INJ –% TBSA |
| BF4 | (a2Macro – 5.49)+*(TBSA – 75)+ | −0.02 | a2Macro –% TBSA |
| BF5 | (ALB – 1.39)+*(TBSA – 75)+ | 0.12 | ALB –% TBSA |
| BF6 | (1.39 – ALB)+*(TBSA – 75)+ | 0.04 | ALB –% TBSA |
| BF7 | (MCP‐1 – 11.10)+ | 0.30 | MCP‐1 |
| BF9 | (BUN – 5.58)+*(11.11 – MCP‐1)+ | 0.51 | BUN – MCP‐1 |
| BF11 | (Age – 3.31)+* (TBSA – 75)+ | 0.00 | Age –% TBSA |
| BF13 | AST – 7.03)+* (TBSA – 75)+ | −0.04 | AST –% TBSA |
| BF15 | (Glu – 6.97)+* (TBSA – 75)+ | 0.05 | Glu –°/o TBSA |
| BF17 | (Mg2+– 1.07)+ | 1.57 | Mg2+ |
| BF19 | (ALP – 5.21)+*(1.07 – Mg2+)+ | −0.15 | ALP – Mg2+ |
| BF20 | (5.21 – ALP)+*(1.07 – Mg2+)+ | 2.18 | ALP – Mg2+ |
| BF21 | (ALP – 7.61)+*(11.11 – MCP‐1)+ | 0.10 | ALP – MCP‐1 |
| BF23 | (IL‐4 + 16.61)+*(TBSA – 75)+ | 0.00 | IL‐4 –% TBSA |
| BF24 | (ALT – 5.11)+*(TBSA – 75)+ | 0.03 | ALT –% TBSA |
| BF26 | (IL‐5 + 2) *(1.07 – Mg2+) | 0.09 | IL‐5 – Mg2+ |
| BF28 | (AST – 9.06)+ | 0.40 | AST |
| BF30 | (Age – 0.53)+*(Mg2+– 1.07)+ | −0.15 | Age – Mg2+ |
ALB = albumin; am= bas is function coefficient; Bm= basis function; INJ = inhalation injury; TBSA = total burn surface area; (y)+= max(0,y); *= basis function interaction.