Table 2

Numbers exposed and unexposed to engineered nanoparticles

n=89, n (%)Exposed in across Monday analysesExposed in across week analysesNot exposed in across Monday analysesNot exposed in across week analyses
Never exposed55 (61.8)nonoyesyes
Ever exposed34 (38.2)
 Previously exposed, not exposed Monday, not exposed during week of testing6 (6.8)nonoyesyes
 Previously exposed, exposed Monday, exposed during week17 (19.1)yesyesnono
 Previously exposed, not exposed Monday, exposed during week9 (10.1)noyesyesno
 Previously exposed, exposed Monday, not exposed during week2 (2.2)yesyesnono