Table 4 Comparison of pre- and postexposure micronucleus cell count within group 2 (panoramic radiography)

From: Genotoxic effects of X-rays in buccal mucosal cells in children subjected to dental radiographs

Exposure

Mean

s.d.

s.e. of mean

Mean difference

Z

P-value

Pre-exposure to panoramic X-ray

4.20

0.77

0.17

−3.950

−3.947

<0.001a

Postexposure to panoramic X-ray

8.15

0.81

0.18

   
  1. The mean s.d. and mean difference of pre- and post-micronucleus in group 2.
  2. The increase in mean number of cells with micronucleus from pre-exposure to postexposure was found to be statistically significant (P<0.001).
  3. aSignificant difference.
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