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Table 2 Results of normal distribution and homogeneity of the variance test of mechanical parameters

From: Biomechanical analysis of the posterior bony column of the lumbar spine

Mechanical parameters

Nonparametric

Normality test

ANOVA

Homogeneity test

Elastic modulus (MPa)

χ 2 = 51.919

P = 0.000 < 0.05

F = 111.195

P = 0.000

Maximum deformation (%)

χ 2 = 42.519

P = 0.000 < 0.05

F = 42.528

P = 0.000

Ultimate strength (MPa)

χ 2 = 46.820

P = 0.000 < 0.05

F = 59.557

P = 0.000

Maximum load (N)

χ 2 = 50.075

P = 0.000 < 0.05

F = 30.787

P = 0.000

  1. The Kruskal–Wallis test prompted significant differences between groups; one-way analysis of variance (ANOVA) was feasibly performed in each group; the normality test conformed to normal distribution (P = 0.000); and the Levin test showed heterogeneity of variance (P = 0.000)