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Table 8 Influence of various potentially hazardous factors on micronuclei (MN) counts, using all samples (including 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 (mSv) 0–19 66 59.5 4.17 5.84 0.5867
20–99 29 26.1 3.48 4.32
100–249 5 4.5 7.40 10.02
250–499 8 7.2 4.71 3.86
≥500 3 2.7 3.67 0.58
Age at buccal sample (years) 40–49 19 17.1 4.21 7.08 0.7879
50–59 33 29.7 3.37 4.90
60–69 40 36.0 5.34 5.74
≥70 19 17.1 2.99 3.77
Years since last exposure < 12 14 12.6 3.81 4.66 0.4611
12–13 35 31.5 5.36 6.89
≥ 14 59 53.2 3.55 4.77
Unknown 3 2.7 3.67 3.51
Days of active work in Chornobyl exclusion zone 0 1 0.9 4.00 0.00 0.9364
1–29 21 18.9 4.22 5.18
30–59 46 41.4 3.85 5.30
60–89 20 18.0 6.03 7.89
90–179 15 13.5 3.39 3.41
≥ 180 8 7.2 2.54 2.98
Smoking status Never smoker/missing 40 36.0 3.85 5.85 0.2428
Former and current smokers 71 64.0 4.33 5.31
Alcohol consumption status Never drinker/missing 25 22.5 3.82 6.36 0.6316
Former and current drinkers 86 77.5 4.26 5.25
Work as industrial radiographer Never 107 96.4 4.16 5.45 0.0475
Ever 1 0.9 15.00 0.00
Unknown 3 2.7 0.33 0.58
Work with potential radiation exposure (other than Chornobyl) Never 94 84.7 4.30 5.62 0.6426
Ever 16 14.4 3.54 4.92
Unknown 1 0.9 1.00 0.00
Work in nuclear industry (including Chornobyl NPP) Never 102 91.9 4.33 5.68 0.1705
Ever 6 5.4 3.11 0.84
Unknown 3 2.7 0.33 0.58
Work in army with potential radiation exposure (excluding Chornobyl) Never 103 92.8 4.29 5.49 0.2015
Ever 6 5.4 3.17 6.34
Unknown 2 1.8 0.50 0.71
Work with potential radiation exposure (excluding Chornobyl) Never 106 95.5 4.31 5.56 0.2436
Ever 3 2.7 1.33 2.31
Unknown 2 1.8 0.50 0.71
Radiotherapy for conditions other than cancer Never 109 98.2 4.17 5.52 0.3851
Ever 1 0.9 6.67 0.00
Unknown 1 0.9 0.00 0.00
Any dental X-rays Never 46 41.4 4.45 6.16 0.1184
Ever 65 58.6 3.95 5.00
Any chest X-rays Never 54 48.6 3.40 5.47 0.1464
Ever 55 49.5 4.93 5.52
Unknown 2 1.8 3.33 4.71
Any bone X-rays Never 62 55.9 4.70 6.33 0.2739
Ever 48 43.2 3.55 4.17
Unknown 1 0.9 0.00 0.00
X-rays other than dental, chest, bone Never 77 69.4 3.72 5.48 0.0629
Ever 33 29.7 5.31 5.47
Unknown 1 0.9 0.00 0.00
Total   111 100.0 4.16 5.49  
  1. Heterogeneity p-values are adjusted for overdispersion