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Table 2 Descriptive statistics of the enamel hardness

From: In vitro study of the potential protection of sound enamel against demineralization

Group N Mean (kgf/mm2) SD Minimum Maximum
1 10 352.5 ±13.8 334.8 370.0
2 10 301.6 ±34.0 227.3 341.3
3 10 380.5 ±53.8 309.4 679.4
4 10 333.6 ±18.0 314.3 373.4
5 10 370.7 ±38.8 304.1 660.1
  1. F = 3.42; P = 0.009. Significance at P ≤ 0.05