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Table 2 Sandblasting significantly increased mean shear bond strength (Mann–Whitney-U-test)

From: Shear bond strength of different retainer wires and bonding adhesives in consideration of the pretreatment process

Sandblasting n M SD U z p r
Yes 100 109.57 28.04 8581 8.75 <0.001 0.62
No 100 50.49 50.32     
  1. n = number of tested specimens; M = mean; SD = standard deviation; U = test statistic Mann–Whitney-U-test; z = standardized test statistic (z-score); p = significance level; r = Pearson’s correlation coefficient (effect size).