| Williams et al., 2007 | Present study, 2015 | One-sample t-test | Remark | Pearson’s correlation | Remark |
kVp | 106 | 73 | p = 0.000 | Statistically significant | r = 0.236 | Not clinically significant |
mAs | 3.33 | 10 | p = 0.002 | Statistically significant | r = 0.675 | Clinically significant |