Table. 6.

Table. 6.

Step by step lightness changes

Group Lightness value Base Step 1+Step 2 p-value1 (Z)



BASE After Step 1 After Step 2 Delta Step 1 Delta Step 2 Mean SD Mean SD
Condition 1 11 3 5 8 −2 7.25 3.76 3.50 2.51 0.027 (−2.207)
5 2 1 3 1
5 2 2 3 0
5 2 2 3 0
5 1 2 4 −1
Condition 2 5 5 1 0 4
2 2 2 1 0 6.20 2.68 2.40 1.52 0.039 (−2.060)
5 2 2 3 0
12 11 7 1 4
11 9 5 2 4
11 9 5 2 4
Condition 3 14 3 6 11 −3 6.50 3.02 2.63 1.51 0.018 (−2.375)
3 2 2 1 0
9 5 5 4 0
11 7 5 4 2
9 3 5 6 −2
Condition 4 5 2 2 3 0 9.20 4.02 4.60 1.52 0.042 (−2.032)
7 1 2 6 −1
7 5 2 2 3
3 1 1 2 0
8 4 5 4 −1
11 5 5 6 0
9 5 2 4 3
2 2 2 0 0

1p-value by paired t-test.

Int J Clin Prev Dent 2024;20:39-46 https://doi.org/10.15236/ijcpd.2024.20.2.39
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