Validation results for repeatability and within-lab reproducibility for total-Ti and particle-TiO2 in human tissue. Repeatability and intermediate precision are expressed as relative standard deviations.

Table 2: Validation results for repeatability and within-lab reproducibility for total-Ti and particle-TiO₂ in human tissue. Repeatability and intermediate precision are expressed as relative standard deviations.

Parameter	Concentration level	s_r (%)	s_RL (%)
Total-Ti	as in sample	24	31
Particle diameter	as in sample	29	24
Particle number concentration	as in sample	20	46
Particle mass concentration	as in sample	22	39