Table 1.

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

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

Values with the superscript asterisk were significantly different (p < 0.05)