Fig. 1.

Mean aneuploidy frequencies of all 24 chromosomes in workers exposed to formaldehyde and unexposed controls. Mean unadjusted frequency and standard errors of (A) monosomy, (B) trisomy and (C) tetrasomy for all 24 chromosomes in unexposed controls (n = 23) and exposed workers (n = 29) are shown. P-values indicating significance of the increase relative to controls, which are from models adjusted for covariates shown in Tables 2–4, respectively, are denoted as ****<0.0001, ***<0.001, **<0.01 and *<0.05. X(M) represents X chromosome in males.