Figure 2.

T cell subset counts (mean ± SE) among trichloroethylene (TCE) exposed workers and unexposed controls. T cell lymphocyte subset counts in relation to TCE exposure level. P_trend using category of TCE levels (controls, <12 and ≥12 ppm) as a continuous variable (*P_trend < 0.05). The median TCE concentration of all exposed subjects was 12 ppm. Differences in cell counts were tested by linear regression analysis of ln-transformed end point, adjusting for relevant covariates [CD4⁺ central memory, T regulation subsets, CD8⁺ naïve, CD8⁺ central memory cells: adjusted for age, sex; CD4⁺ naïve cells: adjusted for age, sex, infection; CD4⁺ effector memory: adjusted for age, sex, smoking status; CD8⁺ effector memory: adjusted for age, sex, BMI]; *P_trend < 0.05.