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Table 4 ANOVA test and Post Hoc multiple comparisons of mean area fraction of p53 immunopositivity in relation to different grades of MEC:

From: Image cytometric analysis of p53 and mdm-2 expression in primary and recurrent mucoepidermoid carcinoma of parotid gland: immunohistochemical study

Descriptive statistics (P53)
Grade Number of fields (Records) Mean Area Fraction Standard Deviation
Grade I 12 13.18917 1.426180
Grade II 44 20.91700 5.846319
Grade III 32 25.26250 7.679862
ANOVA (p53)
P53   Sum of Squares df Mean Square F P Value
  Between Groups 1295.4 2 647.68 16.478 0.0001
  Within Groups 3183.8 81 39.31   
  Total 686.99 83    
Post Hoc (Tukey HSD)
Dependent Variable (I) Groups (J) Groups Mean Diff. P Value Significance
P53 Mean Area Fraction Grade I Grade II -7.727833 < 0.001 S*
   Grade III -12.073333 < 0.001 S
  Grade II Grade III - 4.345500 < 0.001 S
  1. * The mean difference is significant at the 0.05 level