Skip to main content

Table 1 Influence of various potentially hazardous factors on micronuclei (MN) counts (after exclusion of 6 cancer cases)

From: Buccal mucosa micronuclei counts in relation to exposure to low dose-rate radiation from the Chornobyl nuclear accident and other medical and occupational radiation exposures

   Number % Translocation rate
Mean MN / 1000 scored SD p-value heterogeneity
Dose (mGy) 0–19 62 59.0 3.91 5.78 0.4556
20–99 29 27.6 3.48 4.32
100–249 4 3.8 8.50 11.21
250–499 7 6.7 4.95 4.11
≥500 3 2.9 3.67 0.58
Age at buccal sample (years) 40–49 19 18.1 4.21 7.08 0.7758
50–59 32 30.5 3.40 4.98
60–69 38 36.2 5.12 5.61
≥70 16 15.2 2.48 3.67
Years since last exposure < 12 12 10.8 4.00 5.03 0.6956
12–13 34 30.6 5.04 6.74
≥ 14 57 51.4 3.45 4.77
Unknown 2 1.8 3.50 4.95
Days of active work in Chornobyl exclusion zone 0 NA NA NA NA 0.7813
1–29 19 17.1 3.30 4.40
30–59 45 40.5 3.87 5.36
60–89 20 18.0 6.03 7.89
90–179 14 12.6 3.47 3.53
≥ 180 7 6.3 2.48 3.21
Smoking status Never smoker/missing 40 38.1 3.85 5.85 0.3187
Former and current smokers 65 61.9 4.14 5.30
Alcohol consumption status Never drinker/missing 24 22.9 3.82 6.50 0.6585
Former and current drinkers 81 77.1 4.09 5.20
Work as industrial radiographer Never 101 96.2 4.03 5.45 0.0516
Ever 1 1.0 15.00 0.00
Unknown 3 2.9 0.33 0.58
Work with potential radiation exposure (other than Chornobyl) Never 90 85.7 4.27 5.71 0.5483
Ever 14 13.3 2.74 3.89
Unknown 1 1.0 1.00 0.00
Work in nuclear industry (including Chornobyl NPP) Never 97 92.4 4.18 5.67 0.1794
Ever 5 4.8 3.27 0.83
Unknown 3 2.9 0.33 0.58
Work in army with potential radiation exposure (excluding Chornobyl) Never 98 93.3 4.28 5.60 0.0307
Ever 5 4.8 0.60 0.89
Unknown 2 1.9 0.50 0.71
Work with potential radiation exposure (excluding Chornobyl) Never 100 95.2 4.18 5.57 0.2626
Ever 3 2.9 1.33 2.31
Unknown 2 1.9 0.50 0.71
Radiotherapy for conditions other than cancer Never 103 98.1 4.04 5.52 0.3920
Ever 1 1.0 6.67 0.00
Unknown 1 1.0 0.00 0.00
Any dental X-rays Never 43 41.0 4.23 6.11 0.1709
Ever 62 59.0 3.89 5.06
Any chest X-rays Never 53 50.5 3.42 5.52 0.4753
Ever 50 47.6 4.71 5.51
Unknown 2 1.9 3.33 4.71
Any bone X-rays Never 57 54.3 4.51 6.37 0.3192
Ever 47 44.8 3.54 4.22
Unknown 1 1.0 0.00 0.00
X-rays other than dental, chest, bone Never 73 69.5 3.65 5.58 0.0776
Ever 31 29.5 5.06 5.27
Unknown 1 1.0 0.00 0.00
Total   105 100.0 4.03 5.49  
  1. Heterogeneity p-values are adjusted for overdispersion