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. 2019 Apr 22;2019:2785302. doi: 10.1155/2019/2785302

Table 3.

Mean grayscale values of 2 groups at cervical level.

Period Laser Std Control Std t-value df p-value
Baseline 1240.75 78.97 1283.42 66.66 -1.43 22 0.1667
4 weeks 755.92 34.51 726.83 24.18 2.39 22 0.0258
12 weeks 801.75 27.47 783.25 34.92 1.44 22 0.1633

Std: standard deviation.

df: degree of freedom.