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. 2021 Dec;55(4):334–345. doi: 10.15644/asc55/4/1

Table 1. The change in microhardness (VHN) after irradiation compared to the initial measurement (the observed variable is base - irradiation).

Tissue Treatment n Mean Std Median 1. quartile 3. quartile p-valuea
Enamel 70 Gy 20 11,4 7,0 11,4 6,7 16,2 < 0,001
Dentin 70 Gy 20 11,0 7,5 10,8 5,5 15,4 < 0,001
Enamel 2x35 Gy 20 11,2 6,4 11,1 6,7 14,0 < 0,001
Dentin 2x35 Gy 20 12,2 7,3 10,8 7,8 15,9 < 0,001

a P-value t-test for dependent samples.