highly significantp < 0.001
Note that one 90-year-old subject reached the level of young normal subjects, while all other subjects with ARM showed lower performance than all young controls. The analysis of variance (one-way ANOVA with group as factor and post-hoc test, Tamhane procedure) indicates a highly significant difference between the three groups ( F = 25.16; df = 2; p < 0.001) which was caused predominantly by the highly significant difference between the age-matched control group and the ARM group ( p <0.001).