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Table 2 Left: mean dose (air kerma ± standard error) in front of (outside dose) and behind thyroid protection (inside dose), groups L = large, M = medium, S = small; measured values for 1× CC and 1× MLO left breast. Right: Results of ANOVA and Tukey’s range test. Measured values for one craniocaudal view and one mediolateral oblique view of the left breast. Left: paired t-test. Right: ANOVA and Tukey’s range test

From: Effect of thyroid shielding during mammography: measurements on phantom and patient as well as estimation with Monte Carlo simulation

Group Outside dose (mGy) Inside dose (mGy) p value Comparison Outside dose p value Inside dose p value
All (n = 82) 0.187 ± 0.011 0.016 ± 0.002 <  0.001 Overall <  0.001 0.364
L-group (n = 27) 0.249 ± 0.016 0.020 ± 0.004 <  0.001 L-group vs M-group 0.019 0.813
M-group (n = 22) 0.182 ± 0.019 0.017 ± 0.004 <  0.001 L-group vs S-group <  0.001 0.332
S-group (n = 33) 0.141 ± 0.014 0.013 ± 0.003 <  0.001 M-group vs S-group 0.190 0.762