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Table 2 Summarises the values for each cleaning strategy: number of observations, mean grey value and standard deviation

From: Comparative SEM analysis of nine F22 aligner cleaning strategies

Method Length Mean SD
1 5 150.1 9.492
2 5 117.3 7.334
3 5 120.1 11.63
4 5 120.2 14.57
5 5 127.8 17.6
6 5 127.5 12.25
7 5 123 10.28
8 5 119.6 5.865
9 5 80.55 4.232