Table 4

Comparison of mean SCE frequencies between the case and control groups with or without dichotomization by median of the control group

Cases (n = 22)Controls (n = 20)P
SCE frequency (SCEs/cell)6.73 ± 1.536.22 ± 1.110.36a
Dichotomized by median of control
 SCE frequency < 5.9769 (40.9)b10 (50.0)
 SCE frequency ≥ 5.97613 (59.1)10 (50.0)0.88c
  • a Mann-Whitney U test.

  • b No. (%).

  • c χ2 test; odds ratio = 1.25; 95% CI = 0.33–4.66.