Minisatellite paternal mutation rate, paternal age and the year of conception in the control and exposed groups from Ukraine and Belarus. A, The lack of correlation between mutation rate and the paternal age in the control and exposed fathers (Kendall's nonparametric correlation: control Ukrainian fathers, τ=-0.091, P=.6808; exposed Ukrainian fathers, τ=0.033, P=.8695; exposed Belarus fathers, τ=-0.110, P=.5820). B, Paternal mutation rate and the year of conception in the control and exposed group from Ukraine. The dashed lines represent paternal mutation rates (± 95% CI) for the whole control and exposed groups. Data for the Belarus families are taken from previous studies by Dubrova et al. (1996, 1997).