Table 5 Comparison of mean number of cells with micronucleus between the two groups

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

Cells

Group

Mean

s.d.

s.e. of mean

Mean difference

Z

P-Value

Pre-exposure

Group 1

2.80

0.70

0.16

−1.400

−4.391

<0.001a

 

Group 2

4.20

0.77

0.17

   

Postexposure

Group 1

6.05

1.10

0.25

−2.100

−4.840

<0.001a

 

Group 2

8.15

0.81

0.18

   
  1. Before exposure, a higher mean number of cells with micronucleus was recorded in group 2 compared with group 1, and the difference between them was statistically significant (P<0.001).
  2. aSignificant difference.
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