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. 2020 Jun 12;11:894. doi: 10.3389/fphar.2020.00894

Table 4.

Population PK parameters (θ), Inter-individual variability (ω2), Residual variability (σ2) from the final model simultaneously describing saliva and plasma voriconazole pharmacokinetics.

PK parameter Final model estimate RSE (%) Bootstrap estimate (n = 1,000)
(median [95% CI])
Bias (%)
Clearance (CL) = θ1 (L/h)
θ1 4.56 16% 4.39 [3.23–5.98] 3.7%
ω2 0.136 (36.9% CV) 42% 0.115 [0.027–0.230] 15.4%
Central volume of distribution(V) = θ2 (L)
θ2 60.7 12% 57.9 [41.4–72.3] 4.6%
ω2
Absorption rate constant (Ka) = θ3 (t−1)
θ3 0.858 (fixed to model estimate) 0.858 (fixed)
ω2
Bioavailability (F) = θ4
θ4 0.849 14% 0.819 [0.577–0.983] 3.5%
ω2
Scale-factor (Scale) = θ5
θ5 0.501 4% 0.499 [0.458–0.541] 0.4%
ω2
Residual variability model
σ2 Proportional, Plasma 0.057 25% 0.054 [0.032–0.083] 5.3%
σ2 Proportional, Saliva 0.078 26% 0.074 [0.041–0.112] 5.1%

RSE, relative standard error; CI, confidence interval; CV, coefficient of variation.