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Table 1 Influence of etching time on the depth of the enamel erosion depth [μm]

From: Enamel surface alterations after repeated conditioning with HCl

Conditioning time 2 min 2×2 min 2×3 min 2×4 min
Mean 35.95 49.37 66.46 79.22
Standard devation 10.00 11.35 18.06 19.79
Median 34.11* 49.36* 64.28* 77.56*
Minimum 17.75 22.52 32.79 39.91
Maximum 71.34 92.47 151.51 150.58
25 % percentile 28.40 41.77 54.94 66.09
75 % percentile 41.10 55.42 73.67 90.72
  1. Values with the superscript asterisk were significantly different (p < 0.05)